<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <roleRef roleURI="http://www.infinityauto.com/role/AccumulatedOtherComprehensiveIncome" xlink:href="ipcc-20151231.xsd#AccumulatedOtherComprehensiveIncome" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/AccumulatedOtherComprehensiveIncomeDetails" xlink:href="ipcc-20151231.xsd#AccumulatedOtherComprehensiveIncomeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/AccumulatedOtherComprehensiveIncomeTables" xlink:href="ipcc-20151231.xsd#AccumulatedOtherComprehensiveIncomeTables" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/AdditionalInformation" xlink:href="ipcc-20151231.xsd#AdditionalInformation" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/AdditionalInformationDetails" xlink:href="ipcc-20151231.xsd#AdditionalInformationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/AdditionalInformationTables" xlink:href="ipcc-20151231.xsd#AdditionalInformationTables" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/BenefitPlans" xlink:href="ipcc-20151231.xsd#BenefitPlans" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/BenefitPlansAmountRecognizedInBalanceSheetDetails" xlink:href="ipcc-20151231.xsd#BenefitPlansAmountRecognizedInBalanceSheetDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/BenefitPlansEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesDetails" xlink:href="ipcc-20151231.xsd#BenefitPlansEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/BenefitPlansExpectedFutureBenefitPaymentsDetails" xlink:href="ipcc-20151231.xsd#BenefitPlansExpectedFutureBenefitPaymentsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/BenefitPlansFairValueOfPlanAssetsDetails" xlink:href="ipcc-20151231.xsd#BenefitPlansFairValueOfPlanAssetsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/BenefitPlansNarrativeDetails" xlink:href="ipcc-20151231.xsd#BenefitPlansNarrativeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/BenefitPlansNetBenefitObligationAtEndOfYearDetails" xlink:href="ipcc-20151231.xsd#BenefitPlansNetBenefitObligationAtEndOfYearDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/BenefitPlansNetPeriodicBenefitCostDetails" xlink:href="ipcc-20151231.xsd#BenefitPlansNetPeriodicBenefitCostDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/BenefitPlansTables" xlink:href="ipcc-20151231.xsd#BenefitPlansTables" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/BenefitPlansWeightedAverageAssumptionsDetails" xlink:href="ipcc-20151231.xsd#BenefitPlansWeightedAverageAssumptionsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/CommitmentsAndContingencies" xlink:href="ipcc-20151231.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/CommitmentsAndContingenciesDetailsDetails" xlink:href="ipcc-20151231.xsd#CommitmentsAndContingenciesDetailsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/CommitmentsAndContingenciesTables" xlink:href="ipcc-20151231.xsd#CommitmentsAndContingenciesTables" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/ComputationOfEarningsPerShare" xlink:href="ipcc-20151231.xsd#ComputationOfEarningsPerShare" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/ComputationOfEarningsPerShareDetails" xlink:href="ipcc-20151231.xsd#ComputationOfEarningsPerShareDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/ComputationOfEarningsPerShareTables" xlink:href="ipcc-20151231.xsd#ComputationOfEarningsPerShareTables" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/ConsolidatedBalanceSheets" xlink:href="ipcc-20151231.xsd#ConsolidatedBalanceSheets" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:href="ipcc-20151231.xsd#ConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/ConsolidatedStatementOfComprehensiveIncome" xlink:href="ipcc-20151231.xsd#ConsolidatedStatementOfComprehensiveIncome" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/ConsolidatedStatementsOfCashFlows" xlink:href="ipcc-20151231.xsd#ConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" xlink:href="ipcc-20151231.xsd#ConsolidatedStatementsOfChangesInShareholdersEquity" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/ConsolidatedStatementsOfEarnings" xlink:href="ipcc-20151231.xsd#ConsolidatedStatementsOfEarnings" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/DocumentAndEntityInformationDocument" xlink:href="ipcc-20151231.xsd#DocumentAndEntityInformationDocument" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/FairValue" xlink:href="ipcc-20151231.xsd#FairValue" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/FairValueFairValueByHierarchyDetails" xlink:href="ipcc-20151231.xsd#FairValueFairValueByHierarchyDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/FairValueFairValueOfFinancialInstrumentsDetails" xlink:href="ipcc-20151231.xsd#FairValueFairValueOfFinancialInstrumentsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/FairValueLevel3InvestmentsDetails" xlink:href="ipcc-20151231.xsd#FairValueLevel3InvestmentsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/FairValueTables" xlink:href="ipcc-20151231.xsd#FairValueTables" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/IncomeTaxes" xlink:href="ipcc-20151231.xsd#IncomeTaxes" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails" xlink:href="ipcc-20151231.xsd#IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/IncomeTaxesProvisionForIncomeTaxesDetails" xlink:href="ipcc-20151231.xsd#IncomeTaxesProvisionForIncomeTaxesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/IncomeTaxesReconciliationToGaapEffectiveTaxRateDetails" xlink:href="ipcc-20151231.xsd#IncomeTaxesReconciliationToGaapEffectiveTaxRateDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/IncomeTaxesTables" xlink:href="ipcc-20151231.xsd#IncomeTaxesTables" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/InsuranceReserves" xlink:href="ipcc-20151231.xsd#InsuranceReserves" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/InsuranceReservesDetails" xlink:href="ipcc-20151231.xsd#InsuranceReservesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/InsuranceReservesTables" xlink:href="ipcc-20151231.xsd#InsuranceReservesTables" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/Investments" xlink:href="ipcc-20151231.xsd#Investments" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/InvestmentsChangeInUnrealizedGainsAndLossesDetails" xlink:href="ipcc-20151231.xsd#InvestmentsChangeInUnrealizedGainsAndLossesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/InvestmentsContinuousLossPositionInvestmentsDetails" xlink:href="ipcc-20151231.xsd#InvestmentsContinuousLossPositionInvestmentsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/InvestmentsCreditLossesRollforwardDetails" xlink:href="ipcc-20151231.xsd#InvestmentsCreditLossesRollforwardDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/InvestmentsInvestmentIncomeDetails" xlink:href="ipcc-20151231.xsd#InvestmentsInvestmentIncomeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/InvestmentsInvestmentsByContractualMaturityDetails" xlink:href="ipcc-20151231.xsd#InvestmentsInvestmentsByContractualMaturityDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/InvestmentsInvestmentsByMajorCategoryDetails" xlink:href="ipcc-20151231.xsd#InvestmentsInvestmentsByMajorCategoryDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/InvestmentsSummaryOfUnrealizedGainsAndLossesDetails" xlink:href="ipcc-20151231.xsd#InvestmentsSummaryOfUnrealizedGainsAndLossesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/InvestmentsTables" xlink:href="ipcc-20151231.xsd#InvestmentsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/InvestmentsTextualDetails" xlink:href="ipcc-20151231.xsd#InvestmentsTextualDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/InvestmentsUnrealizedLossesByAgeAndSeverityDetails" xlink:href="ipcc-20151231.xsd#InvestmentsUnrealizedLossesByAgeAndSeverityDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/LegalAndRegulatoryProceedings" xlink:href="ipcc-20151231.xsd#LegalAndRegulatoryProceedings" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/LongTermDebt" xlink:href="ipcc-20151231.xsd#LongTermDebt" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/LongTermDebtDetails" xlink:href="ipcc-20151231.xsd#LongTermDebtDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/QuarterlyOperatingResultsDetails" xlink:href="ipcc-20151231.xsd#QuarterlyOperatingResultsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/QuarterlyOperatingResultsTables" xlink:href="ipcc-20151231.xsd#QuarterlyOperatingResultsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/QuarterlyOperatingResultsUnaudited" xlink:href="ipcc-20151231.xsd#QuarterlyOperatingResultsUnaudited" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/QuarterlyOperatingResultsUnauditedPriorPeriodAdjustmentsDetails" xlink:href="ipcc-20151231.xsd#QuarterlyOperatingResultsUnauditedPriorPeriodAdjustmentsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/Reinsurance" xlink:href="ipcc-20151231.xsd#Reinsurance" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/ReinsuranceNarrativeDetails" xlink:href="ipcc-20151231.xsd#ReinsuranceNarrativeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/ReinsuranceTableDetails" xlink:href="ipcc-20151231.xsd#ReinsuranceTableDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/ReinsuranceTables" xlink:href="ipcc-20151231.xsd#ReinsuranceTables" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/ShareBasedCompensation" xlink:href="ipcc-20151231.xsd#ShareBasedCompensation" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/ShareBasedCompensationCompensationCostDetails" xlink:href="ipcc-20151231.xsd#ShareBasedCompensationCompensationCostDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/ShareBasedCompensationEmployeeStockPurchasePlanDetails" xlink:href="ipcc-20151231.xsd#ShareBasedCompensationEmployeeStockPurchasePlanDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/ShareBasedCompensationFairValueAssumptionsDetails" xlink:href="ipcc-20151231.xsd#ShareBasedCompensationFairValueAssumptionsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/ShareBasedCompensationPlansDetails" xlink:href="ipcc-20151231.xsd#ShareBasedCompensationPlansDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/ShareBasedCompensationShareAwardsDetails" xlink:href="ipcc-20151231.xsd#ShareBasedCompensationShareAwardsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/ShareBasedCompensationShareBasedCompensationRestrictedStockActivityDetails" xlink:href="ipcc-20151231.xsd#ShareBasedCompensationShareBasedCompensationRestrictedStockActivityDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/ShareBasedCompensationStockOptionActivityDetails" xlink:href="ipcc-20151231.xsd#ShareBasedCompensationStockOptionActivityDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/ShareBasedCompensationTables" xlink:href="ipcc-20151231.xsd#ShareBasedCompensationTables" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/SignificantReportingAndAccountingPolicies" xlink:href="ipcc-20151231.xsd#SignificantReportingAndAccountingPolicies" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/SignificantReportingAndAccountingPoliciesDetails" xlink:href="ipcc-20151231.xsd#SignificantReportingAndAccountingPoliciesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/SignificantReportingAndAccountingPoliciesPolicies" xlink:href="ipcc-20151231.xsd#SignificantReportingAndAccountingPoliciesPolicies" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/SignificantReportingAndAccountingPoliciesSignificantReportingAndAccountingPoliciesDetails2" xlink:href="ipcc-20151231.xsd#SignificantReportingAndAccountingPoliciesSignificantReportingAndAccountingPoliciesDetails2" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/SignificantReportingAndAccountingPoliciesSignificantReportingAndAccountingPoliciesTables" xlink:href="ipcc-20151231.xsd#SignificantReportingAndAccountingPoliciesSignificantReportingAndAccountingPoliciesTables" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/StatutoryInformation" xlink:href="ipcc-20151231.xsd#StatutoryInformation" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/StatutoryInformationDetails" xlink:href="ipcc-20151231.xsd#StatutoryInformationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/StatutoryInformationTables" xlink:href="ipcc-20151231.xsd#StatutoryInformationTables" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/SubsequentEventsDetails" xlink:href="ipcc-20151231.xsd#SubsequentEventsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.infinityauto.com/role/SubsequentEventsNotes" xlink:href="ipcc-20151231.xsd#SubsequentEventsNotes" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" xlink:type="simple" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/AccumulatedOtherComprehensiveIncome" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/AccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_2609B9BF490766856CE03C9A5F071EED" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_61EC651E530B860724893C9A5F07735C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_2609B9BF490766856CE03C9A5F071EED" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_61EC651E530B860724893C9A5F07735C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_738410BE302B2C1EB2473C9A5F078B55" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_61EC651E530B860724893C9A5F07735C" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_738410BE302B2C1EB2473C9A5F078B55" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_F89E3A5CBED95DAFC9B53C9A5F0712A2_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_738410BE302B2C1EB2473C9A5F078B55" xlink:to="loc_us-gaap_EquityComponentDomain_F89E3A5CBED95DAFC9B53C9A5F0712A2_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_F89E3A5CBED95DAFC9B53C9A5F0712A2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_738410BE302B2C1EB2473C9A5F078B55" xlink:to="loc_us-gaap_EquityComponentDomain_F89E3A5CBED95DAFC9B53C9A5F0712A2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_3CF3E85F3C1F0D37482E3C9A5F071010" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_F89E3A5CBED95DAFC9B53C9A5F0712A2" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_3CF3E85F3C1F0D37482E3C9A5F071010" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_AccumulatedNetUnrealizedGainLossAndOtherThanTemporaryImpairmentMember" xlink:label="loc_ipcc_AccumulatedNetUnrealizedGainLossAndOtherThanTemporaryImpairmentMember_D3CC62220FCED6B060523C9A5F07F16C" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_F89E3A5CBED95DAFC9B53C9A5F0712A2" xlink:to="loc_ipcc_AccumulatedNetUnrealizedGainLossAndOtherThanTemporaryImpairmentMember_D3CC62220FCED6B060523C9A5F07F16C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherThanTemporaryImpairmentMember" xlink:label="loc_us-gaap_AccumulatedOtherThanTemporaryImpairmentMember_267E0795462629B80FDA3C9A5F07537E" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_F89E3A5CBED95DAFC9B53C9A5F0712A2" xlink:to="loc_us-gaap_AccumulatedOtherThanTemporaryImpairmentMember_267E0795462629B80FDA3C9A5F07537E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_EE7F06A87592FCC8BAE43C9A5F073255" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_F89E3A5CBED95DAFC9B53C9A5F0712A2" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_EE7F06A87592FCC8BAE43C9A5F073255" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecreaseAbstract" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecreaseAbstract_7696CE515C6AC5E177113C9A5F0722AE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_2609B9BF490766856CE03C9A5F071EED" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecreaseAbstract_7696CE515C6AC5E177113C9A5F0722AE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1_7531C9DF9BEDD451A24C3C9A5F076384" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecreaseAbstract_7696CE515C6AC5E177113C9A5F0722AE" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1_7531C9DF9BEDD451A24C3C9A5F076384" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_70CF9CE135342CED5D083C9A5F079A0E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecreaseAbstract_7696CE515C6AC5E177113C9A5F0722AE" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_70CF9CE135342CED5D083C9A5F079A0E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_7B73B35245DE27D519713C9A5F078078" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecreaseAbstract_7696CE515C6AC5E177113C9A5F0722AE" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_7B73B35245DE27D519713C9A5F078078" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_ReclassicificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax" xlink:label="loc_ipcc_ReclassicificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_044150D8C36FFCA134D53C9A5F07369D" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecreaseAbstract_7696CE515C6AC5E177113C9A5F0722AE" xlink:to="loc_ipcc_ReclassicificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_044150D8C36FFCA134D53C9A5F07369D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossTaxAbstract" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTaxAbstract_00593AE25462083D31573C9A5F07B1C3" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_2609B9BF490766856CE03C9A5F071EED" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTaxAbstract_00593AE25462083D31573C9A5F07B1C3" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_AccumulatedOtherComprehensiveIncomeLossTax" xlink:label="loc_ipcc_AccumulatedOtherComprehensiveIncomeLossTax_84EE3480A6199DEF27703C9A5F074744" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossTaxAbstract_00593AE25462083D31573C9A5F07B1C3" xlink:to="loc_ipcc_AccumulatedOtherComprehensiveIncomeLossTax_84EE3480A6199DEF27703C9A5F074744" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_8F6C517404E53861E6543C9A5F070572" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossTaxAbstract_00593AE25462083D31573C9A5F07B1C3" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_8F6C517404E53861E6543C9A5F070572" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_ReclassicificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodTax" xlink:label="loc_ipcc_ReclassicificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodTax_C59768EEE2F2278FF8343C9A5F075AB5" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossTaxAbstract_00593AE25462083D31573C9A5F07B1C3" xlink:to="loc_ipcc_ReclassicificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodTax_C59768EEE2F2278FF8343C9A5F075AB5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTax_63BB3AF956350DE5A99D3C9A5F076260" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossTaxAbstract_00593AE25462083D31573C9A5F07B1C3" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTax_63BB3AF956350DE5A99D3C9A5F076260" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_6039425533E418790A653C9A5F073B8E" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_2609B9BF490766856CE03C9A5F071EED" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_6039425533E418790A653C9A5F073B8E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_64637B56D135D10B21BE3C9A5F07B978" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_6039425533E418790A653C9A5F073B8E" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_64637B56D135D10B21BE3C9A5F07B978" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_ReclassicificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax" xlink:label="loc_ipcc_ReclassicificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_8E18808EFCB659B1F45F3C9A5F077394" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_6039425533E418790A653C9A5F073B8E" xlink:to="loc_ipcc_ReclassicificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_8E18808EFCB659B1F45F3C9A5F077394" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_EE056D3D52E354F14D123C9A5F07BCAC" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_6039425533E418790A653C9A5F073B8E" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_EE056D3D52E354F14D123C9A5F07BCAC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_EFD84C526B7DB3D3DCE73C9A5F079780" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_6039425533E418790A653C9A5F073B8E" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_EFD84C526B7DB3D3DCE73C9A5F079780" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/AccumulatedOtherComprehensiveIncomeTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/AdditionalInformation" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/AdditionalInformationDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/AdditionalInformationTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/BenefitPlans" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/BenefitPlansAmountRecognizedInBalanceSheetDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/BenefitPlansEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/BenefitPlansExpectedFutureBenefitPaymentsDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/BenefitPlansFairValueOfPlanAssetsDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/BenefitPlansNarrativeDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualPostretirementBenefitsTable" xlink:label="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualPostretirementBenefitsTable_F013802EABA0B4C0889E0A343ADBDBAA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualPostretirementBenefitsTable_F013802EABA0B4C0889E0A343ADBDBAA" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_DefinedContributionPlanEmployerMatchThresholdAxis" xlink:label="loc_ipcc_DefinedContributionPlanEmployerMatchThresholdAxis_7CD28755F2B04EBE3A4E0A343ADBB74D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualPostretirementBenefitsTable_F013802EABA0B4C0889E0A343ADBDBAA" xlink:to="loc_ipcc_DefinedContributionPlanEmployerMatchThresholdAxis_7CD28755F2B04EBE3A4E0A343ADBB74D" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_DefinedContributionPlanEmployerMatchThresholdDomain" xlink:label="loc_ipcc_DefinedContributionPlanEmployerMatchThresholdDomain_4A5417CF359CD2032E180A343ADB0924_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ipcc_DefinedContributionPlanEmployerMatchThresholdAxis_7CD28755F2B04EBE3A4E0A343ADBB74D" xlink:to="loc_ipcc_DefinedContributionPlanEmployerMatchThresholdDomain_4A5417CF359CD2032E180A343ADB0924_default" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_DefinedContributionPlanEmployerMatchThresholdDomain" xlink:label="loc_ipcc_DefinedContributionPlanEmployerMatchThresholdDomain_4A5417CF359CD2032E180A343ADB0924" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ipcc_DefinedContributionPlanEmployerMatchThresholdAxis_7CD28755F2B04EBE3A4E0A343ADBB74D" xlink:to="loc_ipcc_DefinedContributionPlanEmployerMatchThresholdDomain_4A5417CF359CD2032E180A343ADB0924" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_ThresholdOneMember" xlink:label="loc_ipcc_ThresholdOneMember_EA6BF983B315B3FD67490A343ADB62D7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipcc_DefinedContributionPlanEmployerMatchThresholdDomain_4A5417CF359CD2032E180A343ADB0924" xlink:to="loc_ipcc_ThresholdOneMember_EA6BF983B315B3FD67490A343ADB62D7" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_ThresholdTwoMember" xlink:label="loc_ipcc_ThresholdTwoMember_28B1C8604DB45965EACC0A343ADB1D44" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipcc_DefinedContributionPlanEmployerMatchThresholdDomain_4A5417CF359CD2032E180A343ADB0924" xlink:to="loc_ipcc_ThresholdTwoMember_28B1C8604DB45965EACC0A343ADB1D44" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd#invest_InvestmentAxis" xlink:label="loc_invest_InvestmentAxis_A0A890F97EEC1D61A0470A343ADB3CC9" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualPostretirementBenefitsTable_F013802EABA0B4C0889E0A343ADBDBAA" xlink:to="loc_invest_InvestmentAxis_A0A890F97EEC1D61A0470A343ADB3CC9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd#invest_InvestmentDomain" xlink:label="loc_invest_InvestmentDomain_F3BD8CFE3DEAEA0A13610A343ADBBC42_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_invest_InvestmentAxis_A0A890F97EEC1D61A0470A343ADB3CC9" xlink:to="loc_invest_InvestmentDomain_F3BD8CFE3DEAEA0A13610A343ADBBC42_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd#invest_InvestmentDomain" xlink:label="loc_invest_InvestmentDomain_F3BD8CFE3DEAEA0A13610A343ADBBC42" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_invest_InvestmentAxis_A0A890F97EEC1D61A0470A343ADB3CC9" xlink:to="loc_invest_InvestmentDomain_F3BD8CFE3DEAEA0A13610A343ADBBC42" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_RabbiTrustMember" xlink:label="loc_ipcc_RabbiTrustMember_D74544E053FDE0C01C540A343ADB6D45" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_invest_InvestmentDomain_F3BD8CFE3DEAEA0A13610A343ADBBC42" xlink:to="loc_ipcc_RabbiTrustMember_D74544E053FDE0C01C540A343ADB6D45" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2690A74DFFA0B07FF6660A343ADB8FD6" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualPostretirementBenefitsTable_F013802EABA0B4C0889E0A343ADBDBAA" xlink:to="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2690A74DFFA0B07FF6660A343ADB8FD6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="loc_us-gaap_DefinedBenefitPlansDomain_5F63F3FDFEA6287BD6000A343ADBE8DE_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2690A74DFFA0B07FF6660A343ADB8FD6" xlink:to="loc_us-gaap_DefinedBenefitPlansDomain_5F63F3FDFEA6287BD6000A343ADBE8DE_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="loc_us-gaap_DefinedBenefitPlansDomain_5F63F3FDFEA6287BD6000A343ADBE8DE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2690A74DFFA0B07FF6660A343ADB8FD6" xlink:to="loc_us-gaap_DefinedBenefitPlansDomain_5F63F3FDFEA6287BD6000A343ADBE8DE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember" xlink:label="loc_us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember_391CD00669B3273632890A343ADBBF98" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansDomain_5F63F3FDFEA6287BD6000A343ADBE8DE" xlink:to="loc_us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember_391CD00669B3273632890A343ADBBF98" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis_03328D38FFBA8D8FADFC0A343ADB5E34" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualPostretirementBenefitsTable_F013802EABA0B4C0889E0A343ADBDBAA" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis_03328D38FFBA8D8FADFC0A343ADB5E34" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain" xlink:label="loc_us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain_EA2035F0E6FEFD86CABE0A38D025635B_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis_03328D38FFBA8D8FADFC0A343ADB5E34" xlink:to="loc_us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain_EA2035F0E6FEFD86CABE0A38D025635B_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain" xlink:label="loc_us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain_EA2035F0E6FEFD86CABE0A38D025635B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis_03328D38FFBA8D8FADFC0A343ADB5E34" xlink:to="loc_us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain_EA2035F0E6FEFD86CABE0A38D025635B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember" xlink:label="loc_us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember_B93C096656647842A9580A38D025CA95" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredBonusAndProfitSharingArrangementIndividualContractTypeOfDeferredCompensationDomain_EA2035F0E6FEFD86CABE0A38D025635B" xlink:to="loc_us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember_B93C096656647842A9580A38D025CA95" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_DefinedContributionPlanMaximumEmployeeAnnualContributionPerEmployeeAmount" xlink:label="loc_ipcc_DefinedContributionPlanMaximumEmployeeAnnualContributionPerEmployeeAmount_44CC501804982C0B79710A343AE5D39A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_ipcc_DefinedContributionPlanMaximumEmployeeAnnualContributionPerEmployeeAmount_44CC501804982C0B79710A343AE5D39A" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_DefinedContributionPlanMaximumEmployeeAnnualContributionPerEmployeePercent" xlink:label="loc_ipcc_DefinedContributionPlanMaximumEmployeeAnnualContributionPerEmployeePercent_DE8708B0FF216A3CB2250A343AE59C5A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_ipcc_DefinedContributionPlanMaximumEmployeeAnnualContributionPerEmployeePercent_DE8708B0FF216A3CB2250A343AE59C5A" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_DefinedContributionPlanCatchUpContributionsMinimumAgeOfEmployees" xlink:label="loc_ipcc_DefinedContributionPlanCatchUpContributionsMinimumAgeOfEmployees_744C045EF0655FA85C5C0A343AE5578B" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_ipcc_DefinedContributionPlanCatchUpContributionsMinimumAgeOfEmployees_744C045EF0655FA85C5C0A343AE5578B" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_DefinedContributionPlanCatchUpContributionsMaximumEmployeeAnnualContributionPerEmployeeAmount" xlink:label="loc_ipcc_DefinedContributionPlanCatchUpContributionsMaximumEmployeeAnnualContributionPerEmployeeAmount_7C36D65160172E4A1F750A343AE551D1" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_ipcc_DefinedContributionPlanCatchUpContributionsMaximumEmployeeAnnualContributionPerEmployeeAmount_7C36D65160172E4A1F750A343AE551D1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent" xlink:label="loc_us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent_4B765B40ABA9FE5C64C80A343AE56BFC" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent_4B765B40ABA9FE5C64C80A343AE56BFC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_0B8D3C0A8A3A71E00D980A343AE5A51C" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_0B8D3C0A8A3A71E00D980A343AE5A51C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount" xlink:label="loc_us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount_9C616AAAB27E44BFB75B0A343AE57071" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount_9C616AAAB27E44BFB75B0A343AE57071" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution_DDEBE8E46ED86ED0DD000A343AE57663" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution_DDEBE8E46ED86ED0DD000A343AE57663" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_DeferredCompensationArrangementWithIndividualStatutoryAnnualCompensaitonLimit" xlink:label="loc_ipcc_DeferredCompensationArrangementWithIndividualStatutoryAnnualCompensaitonLimit_0658EC330428F2DEB97C0A343AE5D425" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_ipcc_DeferredCompensationArrangementWithIndividualStatutoryAnnualCompensaitonLimit_0658EC330428F2DEB97C0A343AE5D425" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsHeldInTrust" xlink:label="loc_us-gaap_AssetsHeldInTrust_B2D7DD51A2B191CEAA880A343AE58199" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_us-gaap_AssetsHeldInTrust_B2D7DD51A2B191CEAA880A343AE58199" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability_9CED04C3AB4FF85E0F8E0A343AE5598D" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability_9CED04C3AB4FF85E0F8E0A343AE5598D" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_DeferredCompensationArrangementWithIndividualIncreaseToLiabilityFromInterestEarnedDuringPeriod" xlink:label="loc_ipcc_DeferredCompensationArrangementWithIndividualIncreaseToLiabilityFromInterestEarnedDuringPeriod_42AA2E3AA970BF73D8FF0A343AE5F146" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_ipcc_DeferredCompensationArrangementWithIndividualIncreaseToLiabilityFromInterestEarnedDuringPeriod_42AA2E3AA970BF73D8FF0A343AE5F146" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_8FF2D047DB94CB9D13FC0A343AE5FD82" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_8FF2D047DB94CB9D13FC0A343AE5FD82" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax_49CAF23DB0F9DFD9D2CC0A343AE51E2D" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax_49CAF23DB0F9DFD9D2CC0A343AE51E2D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanPlanAmendments" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAmendments_64A5DB6E60B3522D662F0A343AE50EB0" xlink:type="locator" />
    <definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAmendments_64A5DB6E60B3522D662F0A343AE50EB0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_2B3B65366ED16A81717D0A343AE53135" xlink:type="locator" />
    <definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_2B3B65366ED16A81717D0A343AE53135" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax_528C90EC5EA8F78C1C6D0A343AE51943" xlink:type="locator" />
    <definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax_528C90EC5EA8F78C1C6D0A343AE51943" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss" xlink:label="loc_us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss_DDCD19357B0C90AC0AC00A343AEFEC0C" xlink:type="locator" />
    <definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss_DDCD19357B0C90AC0AC00A343AEFEC0C" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_DefinedBenefitPlanEstimatedAmortizationOfPriorServiceCostCreditInNextFiscalYear" xlink:label="loc_ipcc_DefinedBenefitPlanEstimatedAmortizationOfPriorServiceCostCreditInNextFiscalYear_890D1BFCC1D6C17427FE0A343AEF0652" xlink:type="locator" />
    <definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_ipcc_DefinedBenefitPlanEstimatedAmortizationOfPriorServiceCostCreditInNextFiscalYear_890D1BFCC1D6C17427FE0A343AEF0652" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan" xlink:label="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_6A1941437B09FFA5DB1B0A343AEF9002" xlink:type="locator" />
    <definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_6A1941437B09FFA5DB1B0A343AEF9002" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear" xlink:label="loc_us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear_71C58CCCED03009CF9A50A343AEF60EE" xlink:type="locator" />
    <definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear_71C58CCCED03009CF9A50A343AEF60EE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedContributionPlanCostRecognized" xlink:label="loc_us-gaap_DefinedContributionPlanCostRecognized_518A93C21C730B0141610A343AEFDBFF" xlink:type="locator" />
    <definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_us-gaap_DefinedContributionPlanCostRecognized_518A93C21C730B0141610A343AEFDBFF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_66132DCD36123F6609B20A343AEF2B1F" xlink:type="locator" />
    <definitionArc order="23" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_166A0BC9CE8D40C1BEC80A343AE5BB58" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_66132DCD36123F6609B20A343AEF2B1F" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/BenefitPlansNetBenefitObligationAtEndOfYearDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/BenefitPlansNetPeriodicBenefitCostDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/BenefitPlansTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/BenefitPlansWeightedAverageAssumptionsDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/CommitmentsAndContingenciesDetailsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasedAssetsLineItems" xlink:label="loc_us-gaap_OperatingLeasedAssetsLineItems_5F9D7BB9A7262ECEE5DFB24F12953DA1" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfOperatingLeasedAssetsTable" xlink:label="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_D8729E8CB4FB4DAC50A0B24F12950F1D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_5F9D7BB9A7262ECEE5DFB24F12953DA1" xlink:to="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_D8729E8CB4FB4DAC50A0B24F12950F1D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_306345B571A81743BB33B24F129598A8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_D8729E8CB4FB4DAC50A0B24F12950F1D" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_306345B571A81743BB33B24F129598A8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_D9103EC8088D92BEE718B24F12957C70_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_306345B571A81743BB33B24F129598A8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_D9103EC8088D92BEE718B24F12957C70_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_D9103EC8088D92BEE718B24F12957C70" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_306345B571A81743BB33B24F129598A8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_D9103EC8088D92BEE718B24F12957C70" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AutomobilesMember" xlink:label="loc_us-gaap_AutomobilesMember_A8BBB3D960862DF793E0B24F129597D5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_D9103EC8088D92BEE718B24F12957C70" xlink:to="loc_us-gaap_AutomobilesMember_A8BBB3D960862DF793E0B24F129597D5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityByLocationAxis" xlink:label="loc_dei_EntityByLocationAxis_C7886B6A2AB3CF4B8952B24F1295070E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_D8729E8CB4FB4DAC50A0B24F12950F1D" xlink:to="loc_dei_EntityByLocationAxis_C7886B6A2AB3CF4B8952B24F1295070E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LocationDomain" xlink:label="loc_dei_LocationDomain_355289AB6B04619A1E0CB24F12950623_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_EntityByLocationAxis_C7886B6A2AB3CF4B8952B24F1295070E" xlink:to="loc_dei_LocationDomain_355289AB6B04619A1E0CB24F12950623_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LocationDomain" xlink:label="loc_dei_LocationDomain_355289AB6B04619A1E0CB24F12950623" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_EntityByLocationAxis_C7886B6A2AB3CF4B8952B24F1295070E" xlink:to="loc_dei_LocationDomain_355289AB6B04619A1E0CB24F12950623" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_MiamiFloridaMember" xlink:label="loc_ipcc_MiamiFloridaMember_1E0E98CA48DC192EAD5CB24F15921568" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_LocationDomain_355289AB6B04619A1E0CB24F12950623" xlink:to="loc_ipcc_MiamiFloridaMember_1E0E98CA48DC192EAD5CB24F15921568" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_LosAngelesCaliforniaMember" xlink:label="loc_ipcc_LosAngelesCaliforniaMember_4D56089846F7A2AF9030B24F1295B89D" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_LocationDomain_355289AB6B04619A1E0CB24F12950623" xlink:to="loc_ipcc_LosAngelesCaliforniaMember_4D56089846F7A2AF9030B24F1295B89D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_C5C38045CEE22850BF91B24F1295ACE9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_5F9D7BB9A7262ECEE5DFB24F12953DA1" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_C5C38045CEE22850BF91B24F1295ACE9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_91F12FBEC09671EDFB64B24F12952D3F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_C5C38045CEE22850BF91B24F1295ACE9" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_91F12FBEC09671EDFB64B24F12952D3F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_1B8B346A824523866466B24F12951FC2" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_C5C38045CEE22850BF91B24F1295ACE9" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_1B8B346A824523866466B24F12951FC2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_735519C915D3847CFC5EB24F12952D61" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_C5C38045CEE22850BF91B24F1295ACE9" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_735519C915D3847CFC5EB24F12952D61" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_3C0ED8A4F607B9A7BA17B24F1295AF66" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_C5C38045CEE22850BF91B24F1295ACE9" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_3C0ED8A4F607B9A7BA17B24F1295AF66" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_82A0BCA1F438376450A7B24F1295D607" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_C5C38045CEE22850BF91B24F1295ACE9" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_82A0BCA1F438376450A7B24F1295D607" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_3217A40C7EE23BC39710B24F1295D8E7" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_C5C38045CEE22850BF91B24F1295ACE9" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_3217A40C7EE23BC39710B24F1295D8E7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_6B8BD42E87838FE9D581B24F1295CC90" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_C5C38045CEE22850BF91B24F1295ACE9" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_6B8BD42E87838FE9D581B24F1295CC90" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_OperatingLeasesLeaseExpirationTerm" xlink:label="loc_ipcc_OperatingLeasesLeaseExpirationTerm_BA6CEB6BE0C3A427DC2BB24F1295F8B3" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_C5C38045CEE22850BF91B24F1295ACE9" xlink:to="loc_ipcc_OperatingLeasesLeaseExpirationTerm_BA6CEB6BE0C3A427DC2BB24F1295F8B3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_B6A544EF8868B4D53FE8B24F1295D484" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_5F9D7BB9A7262ECEE5DFB24F12953DA1" xlink:to="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_B6A544EF8868B4D53FE8B24F1295D484" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_DAB6AD9D6E9F41DB2063B24F1295C5C3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_B6A544EF8868B4D53FE8B24F1295D484" xlink:to="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_DAB6AD9D6E9F41DB2063B24F1295C5C3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_316CC4E4ADCD447F5548B24F1295B874" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_B6A544EF8868B4D53FE8B24F1295D484" xlink:to="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_316CC4E4ADCD447F5548B24F1295B874" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_366CBDB4723F906A1930B24F12950036" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_B6A544EF8868B4D53FE8B24F1295D484" xlink:to="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_366CBDB4723F906A1930B24F12950036" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_C758D8511C950DED50FCB24F1295A2EE" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_B6A544EF8868B4D53FE8B24F1295D484" xlink:to="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_C758D8511C950DED50FCB24F1295A2EE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_19640B32310D446B3F8CB24F1295F182" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_B6A544EF8868B4D53FE8B24F1295D484" xlink:to="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_19640B32310D446B3F8CB24F1295F182" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter_79B9BD7C1BEFD320265EB24F1295AF15" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_B6A544EF8868B4D53FE8B24F1295D484" xlink:to="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter_79B9BD7C1BEFD320265EB24F1295AF15" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_85933DCAAF1BAC15B212B24F1295AFA9" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_B6A544EF8868B4D53FE8B24F1295D484" xlink:to="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_85933DCAAF1BAC15B212B24F1295AFA9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LeaseAndRentalExpense" xlink:label="loc_us-gaap_LeaseAndRentalExpense_E1BBB9758E2DB706DA20B24F12956734" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_5F9D7BB9A7262ECEE5DFB24F12953DA1" xlink:to="loc_us-gaap_LeaseAndRentalExpense_E1BBB9758E2DB706DA20B24F12956734" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue" xlink:label="loc_us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue_09B025BB87D766F14B92B24F1295E9DA" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_5F9D7BB9A7262ECEE5DFB24F12953DA1" xlink:to="loc_us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue_09B025BB87D766F14B92B24F1295E9DA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesRentExpenseNet" xlink:label="loc_us-gaap_OperatingLeasesRentExpenseNet_159FCF91B613504FA733B24F129577EF" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_5F9D7BB9A7262ECEE5DFB24F12953DA1" xlink:to="loc_us-gaap_OperatingLeasesRentExpenseNet_159FCF91B613504FA733B24F129577EF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GuaranteeObligationsMaximumExposure" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_2551FB0604332BD1CB57B24F12956357" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_5F9D7BB9A7262ECEE5DFB24F12953DA1" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_2551FB0604332BD1CB57B24F12956357" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/CommitmentsAndContingenciesTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/ComputationOfEarningsPerShare" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/ComputationOfEarningsPerShareDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EarningsPerShareDilutedLineItems" xlink:label="loc_us-gaap_EarningsPerShareDilutedLineItems_252B568DC80B9EBB2A423C9A61196143" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_4DCB9C8A0CF59BDC7D343C9A611961C0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_252B568DC80B9EBB2A423C9A61196143" xlink:to="loc_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_4DCB9C8A0CF59BDC7D343C9A611961C0" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_00AAB4EEDB603714E94E3C9A611947C6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_4DCB9C8A0CF59BDC7D343C9A611961C0" xlink:to="loc_us-gaap_AwardTypeAxis_00AAB4EEDB603714E94E3C9A611947C6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_629BC80410E0187BF8753C9A61194695_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_00AAB4EEDB603714E94E3C9A611947C6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_629BC80410E0187BF8753C9A61194695_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_629BC80410E0187BF8753C9A61194695" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_00AAB4EEDB603714E94E3C9A611947C6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_629BC80410E0187BF8753C9A61194695" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_D57E2DB29116D7820B073C9A61199094" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_629BC80410E0187BF8753C9A61194695" xlink:to="loc_us-gaap_RestrictedStockMember_D57E2DB29116D7820B073C9A61199094" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_AF3D2C269513968B4AFD3C9A61199A8E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_629BC80410E0187BF8753C9A61194695" xlink:to="loc_us-gaap_EmployeeStockOptionMember_AF3D2C269513968B4AFD3C9A61199A8E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PerformanceSharesMember" xlink:label="loc_us-gaap_PerformanceSharesMember_3B1896F0B354AF3771803C9A61198895" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_629BC80410E0187BF8753C9A61194695" xlink:to="loc_us-gaap_PerformanceSharesMember_3B1896F0B354AF3771803C9A61198895" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_FFA217CAB9DD021855613C9A6119F130" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_252B568DC80B9EBB2A423C9A61196143" xlink:to="loc_us-gaap_NetIncomeLoss_FFA217CAB9DD021855613C9A6119F130" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_C37FFA80BB9507E72E2E3C9A6119FCC2" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_252B568DC80B9EBB2A423C9A61196143" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_C37FFA80BB9507E72E2E3C9A6119FCC2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_B5B787FE3BEB9A6AEC5D3C9A611982CF" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_252B568DC80B9EBB2A423C9A61196143" xlink:to="loc_us-gaap_EarningsPerShareBasic_B5B787FE3BEB9A6AEC5D3C9A611982CF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_FFE25177239603970FCA3C9A61197427" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_252B568DC80B9EBB2A423C9A61196143" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_FFE25177239603970FCA3C9A61197427" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_531A5602EADDED4580553C9A6119AD75" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_252B568DC80B9EBB2A423C9A61196143" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_531A5602EADDED4580553C9A6119AD75" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_958FFB3A6A79A6C13F6A3C9A6119B35D" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_252B568DC80B9EBB2A423C9A61196143" xlink:to="loc_us-gaap_EarningsPerShareDiluted_958FFB3A6A79A6C13F6A3C9A6119B35D" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/ComputationOfEarningsPerShareTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/ConsolidatedBalanceSheets" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/ConsolidatedStatementOfComprehensiveIncome" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_0D0CB2E3DA3BE7F0B5053C9A605EB1EC" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_88472E5B0866E8C4B25C3C9A605E35BB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_0D0CB2E3DA3BE7F0B5053C9A605EB1EC" xlink:to="loc_us-gaap_StatementTable_88472E5B0866E8C4B25C3C9A605E35BB" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_8A500C9EC599ECA122DB3C9A605E30CD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_88472E5B0866E8C4B25C3C9A605E35BB" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_8A500C9EC599ECA122DB3C9A605E30CD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_C497A5D27E2A4A7F35A13C9A605E89D3_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_8A500C9EC599ECA122DB3C9A605E30CD" xlink:to="loc_us-gaap_EquityComponentDomain_C497A5D27E2A4A7F35A13C9A605E89D3_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_C497A5D27E2A4A7F35A13C9A605E89D3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_8A500C9EC599ECA122DB3C9A605E30CD" xlink:to="loc_us-gaap_EquityComponentDomain_C497A5D27E2A4A7F35A13C9A605E89D3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_F5999E0897EF1DAB7DC93C9A605E0CB7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_C497A5D27E2A4A7F35A13C9A605E89D3" xlink:to="loc_us-gaap_CommonStockMember_F5999E0897EF1DAB7DC93C9A605E0CB7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_B9784D6E28783ADA6FDC3C9A605ED710" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_C497A5D27E2A4A7F35A13C9A605E89D3" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_B9784D6E28783ADA6FDC3C9A605ED710" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_08C8DC124A1B6B8ACC953C9A605EE43B" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_C497A5D27E2A4A7F35A13C9A605E89D3" xlink:to="loc_us-gaap_RetainedEarningsMember_08C8DC124A1B6B8ACC953C9A605EE43B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_D43D7C40723073AF1F353C9A605E3603" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_C497A5D27E2A4A7F35A13C9A605E89D3" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_D43D7C40723073AF1F353C9A605E3603" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TreasuryStockMember" xlink:label="loc_us-gaap_TreasuryStockMember_F23DB25A5CA08A037E663C9A605E812C" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_C497A5D27E2A4A7F35A13C9A605E89D3" xlink:to="loc_us-gaap_TreasuryStockMember_F23DB25A5CA08A037E663C9A605E812C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_AEFB175D854732E7F4543C9A605E7EE0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0D0CB2E3DA3BE7F0B5053C9A605EB1EC" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_AEFB175D854732E7F4543C9A605E7EE0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_3043539D43F1EE15D92B3C9A605E2EE1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_AEFB175D854732E7F4543C9A605E7EE0" xlink:to="loc_us-gaap_StockholdersEquity_3043539D43F1EE15D92B3C9A605E2EE1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_10C269E7B52E781E03503C9A605E1359" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_AEFB175D854732E7F4543C9A605E7EE0" xlink:to="loc_us-gaap_NetIncomeLoss_10C269E7B52E781E03503C9A605E1359" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_A7AAF16909C8A507C0FC3C9A605E9466" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_AEFB175D854732E7F4543C9A605E7EE0" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_A7AAF16909C8A507C0FC3C9A605E9466" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_BF272B5CB1EFDBA02F363C9A605E20F7" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_AEFB175D854732E7F4543C9A605E7EE0" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_BF272B5CB1EFDBA02F363C9A605E20F7" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTaxExcludingOtherThanTemporaryImpairmentPortion" xlink:label="loc_ipcc_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTaxExcludingOtherThanTemporaryImpairmentPortion_631FAD1B703C379C04EB3C9A605EE04A" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_AEFB175D854732E7F4543C9A605E7EE0" xlink:to="loc_ipcc_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTaxExcludingOtherThanTemporaryImpairmentPortion_631FAD1B703C379C04EB3C9A605EE04A" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_NonCreditPortionOfOtherThanTemporaryImpairmentsRecognizedInOtherComprehensiveIncome" xlink:label="loc_ipcc_NonCreditPortionOfOtherThanTemporaryImpairmentsRecognizedInOtherComprehensiveIncome_BC9B42D6CEF753D834BD3C9A605EAE6C" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_AEFB175D854732E7F4543C9A605E7EE0" xlink:to="loc_ipcc_NonCreditPortionOfOtherThanTemporaryImpairmentsRecognizedInOtherComprehensiveIncome_BC9B42D6CEF753D834BD3C9A605EAE6C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_B47DFF17A6745016710C3C9A605E2C2C" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_AEFB175D854732E7F4543C9A605E7EE0" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_B47DFF17A6745016710C3C9A605E2C2C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DividendsCommonStockCash" xlink:label="loc_us-gaap_DividendsCommonStockCash_2BE7E3007A3DFEA7D2DC3C9A605EB2AE" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_AEFB175D854732E7F4543C9A605E7EE0" xlink:to="loc_us-gaap_DividendsCommonStockCash_2BE7E3007A3DFEA7D2DC3C9A605EB2AE" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_StockIssuedDuringPeriodValue" xlink:label="loc_ipcc_StockIssuedDuringPeriodValue_6210D056B659CB49FE8B3C9A605EE6DC" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_AEFB175D854732E7F4543C9A605E7EE0" xlink:to="loc_ipcc_StockIssuedDuringPeriodValue_6210D056B659CB49FE8B3C9A605EE6DC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TreasuryStockValueAcquiredParValueMethod" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredParValueMethod_FCF29042DA463792E92F3C9A605EC2CE" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_AEFB175D854732E7F4543C9A605E7EE0" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredParValueMethod_FCF29042DA463792E92F3C9A605EC2CE" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/ConsolidatedStatementsOfEarnings" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/DocumentAndEntityInformationDocument" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/FairValue" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/FairValueFairValueByHierarchyDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_EC69E751FE43FB3D2FEC3C9A5D91D9CD" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6152D7F68D342E7A93603C9A5D912F46" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_EC69E751FE43FB3D2FEC3C9A5D91D9CD" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6152D7F68D342E7A93603C9A5D912F46" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_A4DD25D6887098C2D2373C9A5D9173B1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6152D7F68D342E7A93603C9A5D912F46" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_A4DD25D6887098C2D2373C9A5D9173B1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_F4CB6BBFF19E558CB8683C9A5D91F0F3_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_A4DD25D6887098C2D2373C9A5D9173B1" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_F4CB6BBFF19E558CB8683C9A5D91F0F3_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_F4CB6BBFF19E558CB8683C9A5D91F0F3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_A4DD25D6887098C2D2373C9A5D9173B1" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_F4CB6BBFF19E558CB8683C9A5D91F0F3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_5D5AA654E04813EC25FB3C9A5D9149A3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_F4CB6BBFF19E558CB8683C9A5D91F0F3" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_5D5AA654E04813EC25FB3C9A5D9149A3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_48EB16EAFC555CD63C983C9A5D91B549" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6152D7F68D342E7A93603C9A5D912F46" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_48EB16EAFC555CD63C983C9A5D91B549" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_B77A0DD402ADD92706683C9A5D911F01_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_48EB16EAFC555CD63C983C9A5D91B549" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_B77A0DD402ADD92706683C9A5D911F01_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_B77A0DD402ADD92706683C9A5D911F01" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_48EB16EAFC555CD63C983C9A5D91B549" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_B77A0DD402ADD92706683C9A5D911F01" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtSecuritiesMember" xlink:label="loc_us-gaap_DebtSecuritiesMember_0301FDA2E9C7BEC03A843C9A5D91C9AA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_B77A0DD402ADD92706683C9A5D911F01" xlink:to="loc_us-gaap_DebtSecuritiesMember_0301FDA2E9C7BEC03A843C9A5D91C9AA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_USGovernmentDebtSecuritiesMember" xlink:label="loc_us-gaap_USGovernmentDebtSecuritiesMember_24751C7D4FFAAD68851C3C9A5D911894" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_0301FDA2E9C7BEC03A843C9A5D91C9AA" xlink:to="loc_us-gaap_USGovernmentDebtSecuritiesMember_24751C7D4FFAAD68851C3C9A5D911894" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_7DA4801875A71576B7F33C9A5D916235" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_0301FDA2E9C7BEC03A843C9A5D91C9AA" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_7DA4801875A71576B7F33C9A5D916235" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MortgageBackedSecuritiesMember" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_5A1A6CDC7BE0F6FB73FB3C9A5D91744E" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_0301FDA2E9C7BEC03A843C9A5D91C9AA" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_5A1A6CDC7BE0F6FB73FB3C9A5D91744E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_A8A0A92660BCE4530BF23C9A5D9110E4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MortgageBackedSecuritiesMember_5A1A6CDC7BE0F6FB73FB3C9A5D91744E" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_A8A0A92660BCE4530BF23C9A5D9110E4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_0DC3700147990C19C27C3C9A5D915893" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MortgageBackedSecuritiesMember_5A1A6CDC7BE0F6FB73FB3C9A5D91744E" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_0DC3700147990C19C27C3C9A5D915893" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CollateralizedDebtObligationsMember" xlink:label="loc_us-gaap_CollateralizedDebtObligationsMember_12E22E7A8DE2A4CEF1D03C9A5D91A1A2" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_0301FDA2E9C7BEC03A843C9A5D91C9AA" xlink:to="loc_us-gaap_CollateralizedDebtObligationsMember_12E22E7A8DE2A4CEF1D03C9A5D91A1A2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember" xlink:label="loc_us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember_A44AACF8C4CC09D1F0A33C9A5D91D6BA" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_0301FDA2E9C7BEC03A843C9A5D91C9AA" xlink:to="loc_us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember_A44AACF8C4CC09D1F0A33C9A5D91D6BA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_526937F4694963E2DF8D3C9A5D912D96" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_0301FDA2E9C7BEC03A843C9A5D91C9AA" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_526937F4694963E2DF8D3C9A5D912D96" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="loc_us-gaap_EquitySecuritiesMember_5EC36F092A0B084E758D3C9A5D9121DC" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_B77A0DD402ADD92706683C9A5D911F01" xlink:to="loc_us-gaap_EquitySecuritiesMember_5EC36F092A0B084E758D3C9A5D9121DC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShortTermInvestmentsMember" xlink:label="loc_us-gaap_ShortTermInvestmentsMember_FA66DBB7292760B6FAF23C9A5D9127F2" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_B77A0DD402ADD92706683C9A5D911F01" xlink:to="loc_us-gaap_ShortTermInvestmentsMember_FA66DBB7292760B6FAF23C9A5D9127F2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_401DC3DB2D63036A23293C9A5D9166B1" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6152D7F68D342E7A93603C9A5D912F46" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_401DC3DB2D63036A23293C9A5D9166B1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_65798CBCAF9BDD315F193C9A5D915BD4_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_401DC3DB2D63036A23293C9A5D9166B1" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_65798CBCAF9BDD315F193C9A5D915BD4_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_65798CBCAF9BDD315F193C9A5D915BD4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_401DC3DB2D63036A23293C9A5D9166B1" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_65798CBCAF9BDD315F193C9A5D915BD4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_19B49C47607D99A150E83C9A5D919F1F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_65798CBCAF9BDD315F193C9A5D915BD4" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_19B49C47607D99A150E83C9A5D919F1F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_9E895BFB1494F23ED4893C9A5D910E35" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_65798CBCAF9BDD315F193C9A5D915BD4" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_9E895BFB1494F23ED4893C9A5D910E35" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_C205842D8DCA95A1014C3C9A5D91D80F" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_65798CBCAF9BDD315F193C9A5D915BD4" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_C205842D8DCA95A1014C3C9A5D91D80F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_73F42DB17B427B563FAD3C9A5D910F1B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_EC69E751FE43FB3D2FEC3C9A5D91D9CD" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_73F42DB17B427B563FAD3C9A5D910F1B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecurities_3387FCADCA355100329C3C9A5D9191AF" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_EC69E751FE43FB3D2FEC3C9A5D91D9CD" xlink:to="loc_us-gaap_AvailableForSaleSecurities_3387FCADCA355100329C3C9A5D9191AF" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_AvailableForSaleSecuritiesAndCashAndCashEquivalentsFairValueDisclosure" xlink:label="loc_ipcc_AvailableForSaleSecuritiesAndCashAndCashEquivalentsFairValueDisclosure_1248D2D80570156AF9C53C9A5D91BF55" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_EC69E751FE43FB3D2FEC3C9A5D91D9CD" xlink:to="loc_ipcc_AvailableForSaleSecuritiesAndCashAndCashEquivalentsFairValueDisclosure_1248D2D80570156AF9C53C9A5D91BF55" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_FairValueDisclosurePercentage" xlink:label="loc_ipcc_FairValueDisclosurePercentage_2FFBB5B59BE0BCDBC0393C9A5D910107" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_EC69E751FE43FB3D2FEC3C9A5D91D9CD" xlink:to="loc_ipcc_FairValueDisclosurePercentage_2FFBB5B59BE0BCDBC0393C9A5D910107" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NotesPayableFairValueDisclosure" xlink:label="loc_us-gaap_NotesPayableFairValueDisclosure_1F76B56CBC78A1925E933C9A5D912193" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_EC69E751FE43FB3D2FEC3C9A5D91D9CD" xlink:to="loc_us-gaap_NotesPayableFairValueDisclosure_1F76B56CBC78A1925E933C9A5D912193" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/FairValueFairValueOfFinancialInstrumentsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_19CDA7D930B26DCF47FA3C9A5FD2FC89" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTable" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_1DAA89F2F8BECCB4D7093C9A5FD2C057" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_19CDA7D930B26DCF47FA3C9A5FD2FC89" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_1DAA89F2F8BECCB4D7093C9A5FD2C057" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_75B6372987BB3F726A063C9A5FD256BC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_1DAA89F2F8BECCB4D7093C9A5FD2C057" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_75B6372987BB3F726A063C9A5FD256BC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_4C32E0CEF57174AF37B83C9A5FD293DD_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_75B6372987BB3F726A063C9A5FD256BC" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_4C32E0CEF57174AF37B83C9A5FD293DD_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_0D7CB4A16A1BC765766D3C9A5FD272CA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_75B6372987BB3F726A063C9A5FD256BC" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_0D7CB4A16A1BC765766D3C9A5FD272CA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_4C32E0CEF57174AF37B83C9A5FD293DD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_0D7CB4A16A1BC765766D3C9A5FD272CA" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_4C32E0CEF57174AF37B83C9A5FD293DD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_FDEBC8354F7B75C6E8653C9A5FD2D77E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_4C32E0CEF57174AF37B83C9A5FD293DD" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_FDEBC8354F7B75C6E8653C9A5FD2D77E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_6B506C8D73E31E6264123C9A5FD285D7" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_4C32E0CEF57174AF37B83C9A5FD293DD" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_6B506C8D73E31E6264123C9A5FD285D7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_90923E1C83FE23A14CD83C9A5FD276E9" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_1DAA89F2F8BECCB4D7093C9A5FD2C057" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_90923E1C83FE23A14CD83C9A5FD276E9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_075637D16F39910432F23C9A5FD240C7_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_90923E1C83FE23A14CD83C9A5FD276E9" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_075637D16F39910432F23C9A5FD240C7_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_075637D16F39910432F23C9A5FD240C7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_90923E1C83FE23A14CD83C9A5FD276E9" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_075637D16F39910432F23C9A5FD240C7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtSecuritiesMember" xlink:label="loc_us-gaap_DebtSecuritiesMember_62731BE1096290A736383C9A5FD2C178" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_075637D16F39910432F23C9A5FD240C7" xlink:to="loc_us-gaap_DebtSecuritiesMember_62731BE1096290A736383C9A5FD2C178" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="loc_us-gaap_EquitySecuritiesMember_467B985D4E68053774143C9A5FD2F2C4" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_075637D16F39910432F23C9A5FD240C7" xlink:to="loc_us-gaap_EquitySecuritiesMember_467B985D4E68053774143C9A5FD2F2C4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShortTermInvestmentsMember" xlink:label="loc_us-gaap_ShortTermInvestmentsMember_833F2432521F6E738BAB3C9A5FD2B77C" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_075637D16F39910432F23C9A5FD240C7" xlink:to="loc_us-gaap_ShortTermInvestmentsMember_833F2432521F6E738BAB3C9A5FD2B77C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_B51086686C9A5E1170663C9A5FD24DA3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_19CDA7D930B26DCF47FA3C9A5FD2FC89" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_B51086686C9A5E1170663C9A5FD24DA3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecurities_DD84E501888E481F2EE13C9A5FD2C778" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_19CDA7D930B26DCF47FA3C9A5FD2FC89" xlink:to="loc_us-gaap_AvailableForSaleSecurities_DD84E501888E481F2EE13C9A5FD2C778" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_AvailableForSaleSecuritiesAndCashAndCashEquivalentsFairValueDisclosure" xlink:label="loc_ipcc_AvailableForSaleSecuritiesAndCashAndCashEquivalentsFairValueDisclosure_4FF099256D91D92F457D3C9A5FD24874" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_19CDA7D930B26DCF47FA3C9A5FD2FC89" xlink:to="loc_ipcc_AvailableForSaleSecuritiesAndCashAndCashEquivalentsFairValueDisclosure_4FF099256D91D92F457D3C9A5FD24874" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NotesPayableFairValueDisclosure" xlink:label="loc_us-gaap_NotesPayableFairValueDisclosure_0C0CC33CC5C3EBE2A85D3C9A5FD2336F" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_19CDA7D930B26DCF47FA3C9A5FD2FC89" xlink:to="loc_us-gaap_NotesPayableFairValueDisclosure_0C0CC33CC5C3EBE2A85D3C9A5FD2336F" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/FairValueLevel3InvestmentsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_0DBDC62B9445BEDD1FF13C9A5DDFCC87" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_DE501D7CA9B44BD5F2D03C9A5DDF072E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_0DBDC62B9445BEDD1FF13C9A5DDFCC87" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_DE501D7CA9B44BD5F2D03C9A5DDF072E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_047171959C6B7BC393EB3C9A5DDF2533" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_DE501D7CA9B44BD5F2D03C9A5DDF072E" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_047171959C6B7BC393EB3C9A5DDF2533" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_E6327E73CE38A1D1B7983C9A5DDF75C4_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_047171959C6B7BC393EB3C9A5DDF2533" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_E6327E73CE38A1D1B7983C9A5DDF75C4_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_E6327E73CE38A1D1B7983C9A5DDF75C4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_047171959C6B7BC393EB3C9A5DDF2533" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_E6327E73CE38A1D1B7983C9A5DDF75C4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_F3688A068217D5E50FD73C9A5DDF0E5F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_E6327E73CE38A1D1B7983C9A5DDF75C4" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_F3688A068217D5E50FD73C9A5DDF0E5F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_AD00CFD92D6EB4983B0E3C9A5DDFB753" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_DE501D7CA9B44BD5F2D03C9A5DDF072E" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_AD00CFD92D6EB4983B0E3C9A5DDFB753" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_81135D8DCC200346104C3C9A5DDF098E_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_AD00CFD92D6EB4983B0E3C9A5DDFB753" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_81135D8DCC200346104C3C9A5DDF098E_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_81135D8DCC200346104C3C9A5DDF098E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_AD00CFD92D6EB4983B0E3C9A5DDFB753" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_81135D8DCC200346104C3C9A5DDF098E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_D5B58EDF40020510256D3C9A5DDF6AFE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_81135D8DCC200346104C3C9A5DDF098E" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_D5B58EDF40020510256D3C9A5DDF6AFE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByAssetClassAxis" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_1CF5C989E3CB2C3674063C9A5DDFAFE6" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_DE501D7CA9B44BD5F2D03C9A5DDF072E" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_1CF5C989E3CB2C3674063C9A5DDFAFE6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_5671CCA5387E0BDCAB7D3C9A5DDFBED2_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_1CF5C989E3CB2C3674063C9A5DDFAFE6" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_5671CCA5387E0BDCAB7D3C9A5DDFBED2_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_5671CCA5387E0BDCAB7D3C9A5DDFBED2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_1CF5C989E3CB2C3674063C9A5DDFAFE6" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_5671CCA5387E0BDCAB7D3C9A5DDFBED2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_USGovernmentDebtSecuritiesMember" xlink:label="loc_us-gaap_USGovernmentDebtSecuritiesMember_F280A8EDC92ECB56532D3C9A5DDF5215" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_5671CCA5387E0BDCAB7D3C9A5DDFBED2" xlink:to="loc_us-gaap_USGovernmentDebtSecuritiesMember_F280A8EDC92ECB56532D3C9A5DDF5215" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_DDC2BAE2F1F5502F40A33C9A5DDFC491" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_5671CCA5387E0BDCAB7D3C9A5DDFBED2" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_DDC2BAE2F1F5502F40A33C9A5DDFC491" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetBackedSecuritiesMember" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_95C00C47BB4B91D7A6593C9A5DDF73BA" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_5671CCA5387E0BDCAB7D3C9A5DDFBED2" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_95C00C47BB4B91D7A6593C9A5DDF73BA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_CEE9F9345BB98DB63B133C9A5DDF12E7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_0DBDC62B9445BEDD1FF13C9A5DDFCC87" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_CEE9F9345BB98DB63B133C9A5DDF12E7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_B5B436F73AD45591EE283C9A5DDF9FB2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_CEE9F9345BB98DB63B133C9A5DDF12E7" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_B5B436F73AD45591EE283C9A5DDF9FB2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_2DE13E6324ABA5882E273C9A5DDF3C56" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_CEE9F9345BB98DB63B133C9A5DDF12E7" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_2DE13E6324ABA5882E273C9A5DDF3C56" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_DC51AA1C2748224CE0023C9A5DDFD5ED" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_CEE9F9345BB98DB63B133C9A5DDF12E7" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_DC51AA1C2748224CE0023C9A5DDFD5ED" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_188B3CA8B37E45FD451E3C9A5DDF17F1" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_CEE9F9345BB98DB63B133C9A5DDF12E7" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_188B3CA8B37E45FD451E3C9A5DDF17F1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_0101229D28B837A8DE6E3C9A5DDFF78E" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_CEE9F9345BB98DB63B133C9A5DDF12E7" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_0101229D28B837A8DE6E3C9A5DDFF78E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_DEA2D29D94C13D1656F43C9A5DDF3C29" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_CEE9F9345BB98DB63B133C9A5DDF12E7" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_DEA2D29D94C13D1656F43C9A5DDF3C29" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_FB60F6DEF71ADCC054C63C9A5DDFFDBB" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_CEE9F9345BB98DB63B133C9A5DDF12E7" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_FB60F6DEF71ADCC054C63C9A5DDFFDBB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_D7FD55BC40FD402EA7403C9A5DDF0D41" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_CEE9F9345BB98DB63B133C9A5DDF12E7" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_D7FD55BC40FD402EA7403C9A5DDF0D41" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNumberOfSecurities" xlink:label="loc_ipcc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNumberOfSecurities_285BF6CD951295627A763C9A5DDFAD63" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_0DBDC62B9445BEDD1FF13C9A5DDFCC87" xlink:to="loc_ipcc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNumberOfSecurities_285BF6CD951295627A763C9A5DDFAD63" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNumberOfNonBindingSecurities" xlink:label="loc_ipcc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNumberOfNonBindingSecurities_0F36C07985308A481B9A3C9A5DDF1F55" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_0DBDC62B9445BEDD1FF13C9A5DDFCC87" xlink:to="loc_ipcc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNumberOfNonBindingSecurities_0F36C07985308A481B9A3C9A5DDF1F55" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisNumberofUnaffiliatedSecurities" xlink:label="loc_ipcc_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisNumberofUnaffiliatedSecurities_7468801A568A5E1BCAB13C9A5DDFFC34" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_0DBDC62B9445BEDD1FF13C9A5DDFCC87" xlink:to="loc_ipcc_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisNumberofUnaffiliatedSecurities_7468801A568A5E1BCAB13C9A5DDFFC34" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisNumberofNationallyRecognizedSecurity" xlink:label="loc_ipcc_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisNumberofNationallyRecognizedSecurity_2E1D0406AFF213D58F903C9A5DDF3768" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_0DBDC62B9445BEDD1FF13C9A5DDFCC87" xlink:to="loc_ipcc_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisNumberofNationallyRecognizedSecurity_2E1D0406AFF213D58F903C9A5DDF3768" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/FairValueTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/IncomeTaxes" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/IncomeTaxesProvisionForIncomeTaxesDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLossCarryforwardsLineItems" xlink:label="loc_us-gaap_OperatingLossCarryforwardsLineItems_A3837852216A447BAE223C9A6109947E" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLossCarryforwardsTable" xlink:label="loc_us-gaap_OperatingLossCarryforwardsTable_EBDBE613209E9637285D3C9A6109DBD0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_A3837852216A447BAE223C9A6109947E" xlink:to="loc_us-gaap_OperatingLossCarryforwardsTable_EBDBE613209E9637285D3C9A6109DBD0" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_0C81106DD3DD4953C1F63C9A6109C6D1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_EBDBE613209E9637285D3C9A6109DBD0" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_0C81106DD3DD4953C1F63C9A6109C6D1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_A8986D01C14A316140053C9A6109E480_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_0C81106DD3DD4953C1F63C9A6109C6D1" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_A8986D01C14A316140053C9A6109E480_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_A8986D01C14A316140053C9A6109E480" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_0C81106DD3DD4953C1F63C9A6109C6D1" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_A8986D01C14A316140053C9A6109E480" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_0827E060F8F1C661F8D23C9A610922A1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_A3837852216A447BAE223C9A6109947E" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_0827E060F8F1C661F8D23C9A610922A1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_E76E389FD4A6E74D094D3C9A6109739F" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_A3837852216A447BAE223C9A6109947E" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_E76E389FD4A6E74D094D3C9A6109739F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_3C317A428353BB231D4B3C9A6109BF5E" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_A3837852216A447BAE223C9A6109947E" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_3C317A428353BB231D4B3C9A6109BF5E" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/IncomeTaxesReconciliationToGaapEffectiveTaxRateDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/IncomeTaxesTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/InsuranceReserves" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/InsuranceReservesDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/InsuranceReservesTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/Investments" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/InvestmentsChangeInUnrealizedGainsAndLossesDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_87249830A7A864AAD92E3C9A5F3621B6" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_210AC179647C2E47F6063C9A5F36151F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_87249830A7A864AAD92E3C9A5F3621B6" xlink:to="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_210AC179647C2E47F6063C9A5F36151F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_695590C0B664A4FB0B173C9A5F363CA0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_210AC179647C2E47F6063C9A5F36151F" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_695590C0B664A4FB0B173C9A5F363CA0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_80581CAEE8E73D4100B53C9A5F36B947_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_695590C0B664A4FB0B173C9A5F363CA0" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_80581CAEE8E73D4100B53C9A5F36B947_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_80581CAEE8E73D4100B53C9A5F36B947" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_695590C0B664A4FB0B173C9A5F363CA0" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_80581CAEE8E73D4100B53C9A5F36B947" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtSecuritiesMember" xlink:label="loc_us-gaap_DebtSecuritiesMember_742DA7A9AA5F8CFE90903C9A5F36165F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_80581CAEE8E73D4100B53C9A5F36B947" xlink:to="loc_us-gaap_DebtSecuritiesMember_742DA7A9AA5F8CFE90903C9A5F36165F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="loc_us-gaap_EquitySecuritiesMember_72EE76D37ED132C003F73C9A5F362AC9" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_80581CAEE8E73D4100B53C9A5F36B947" xlink:to="loc_us-gaap_EquitySecuritiesMember_72EE76D37ED132C003F73C9A5F362AC9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShortTermInvestmentsMember" xlink:label="loc_us-gaap_ShortTermInvestmentsMember_58681CE97B5D3696929D3C9A5F366592" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_80581CAEE8E73D4100B53C9A5F36B947" xlink:to="loc_us-gaap_ShortTermInvestmentsMember_58681CE97B5D3696929D3C9A5F366592" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax_9C3EC299CE17CFE416163C9A5F367D36" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_87249830A7A864AAD92E3C9A5F3621B6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax_9C3EC299CE17CFE416163C9A5F367D36" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments" xlink:label="loc_us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments_365885E86F49AC3DF1873C9A5F367133" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_87249830A7A864AAD92E3C9A5F3621B6" xlink:to="loc_us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments_365885E86F49AC3DF1873C9A5F367133" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities" xlink:label="loc_us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities_03C05781D1340A2A1B1D3C9A5F367745" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_87249830A7A864AAD92E3C9A5F3621B6" xlink:to="loc_us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities_03C05781D1340A2A1B1D3C9A5F367745" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss_1AECCDE446479BB659683C9A5F367F80" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_87249830A7A864AAD92E3C9A5F3621B6" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss_1AECCDE446479BB659683C9A5F367F80" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_B25944FB32CDDA5B33CD3C9A5F36C3B4" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_87249830A7A864AAD92E3C9A5F3621B6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_B25944FB32CDDA5B33CD3C9A5F36C3B4" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_AvailableForSaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairmentsTax" xlink:label="loc_ipcc_AvailableForSaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairmentsTax_DBEEB76E9AC5215F66293C9A5F364D86" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_87249830A7A864AAD92E3C9A5F3621B6" xlink:to="loc_ipcc_AvailableForSaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairmentsTax_DBEEB76E9AC5215F66293C9A5F364D86" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_OtherthanTemporaryImpairmentLossesInvestmentsPortionRecognizedinEarningsNetAvailableforsaleSecuritiesTax" xlink:label="loc_ipcc_OtherthanTemporaryImpairmentLossesInvestmentsPortionRecognizedinEarningsNetAvailableforsaleSecuritiesTax_788259DF728409D6FD913C9A5F36EC16" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_87249830A7A864AAD92E3C9A5F3621B6" xlink:to="loc_ipcc_OtherthanTemporaryImpairmentLossesInvestmentsPortionRecognizedinEarningsNetAvailableforsaleSecuritiesTax_788259DF728409D6FD913C9A5F36EC16" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesIncomeTaxExpenseOnChangeInUnrealizedHoldingGainOrLoss" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesIncomeTaxExpenseOnChangeInUnrealizedHoldingGainOrLoss_9695A533A348E7C371053C9A5F36BB2A" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_87249830A7A864AAD92E3C9A5F3621B6" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesIncomeTaxExpenseOnChangeInUnrealizedHoldingGainOrLoss_9695A533A348E7C371053C9A5F36BB2A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_1783C089EB9CFAF966D63C9A5F36BB4E" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_87249830A7A864AAD92E3C9A5F3621B6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_1783C089EB9CFAF966D63C9A5F36BB4E" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_AvailableForSaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairmentsNetOfTax" xlink:label="loc_ipcc_AvailableForSaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairmentsNetOfTax_B4DF1EFDBC70EF39520D3C9A5F36A7A6" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_87249830A7A864AAD92E3C9A5F3621B6" xlink:to="loc_ipcc_AvailableForSaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairmentsNetOfTax_B4DF1EFDBC70EF39520D3C9A5F36A7A6" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableForSaleSecuritiesNetOfTax" xlink:label="loc_ipcc_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableForSaleSecuritiesNetOfTax_A8212BA7E5AF493279893C9A5F361913" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_87249830A7A864AAD92E3C9A5F3621B6" xlink:to="loc_ipcc_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableForSaleSecuritiesNetOfTax_A8212BA7E5AF493279893C9A5F361913" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax_04FC4064D26B08873BB73C9A5F3696F8" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_87249830A7A864AAD92E3C9A5F3621B6" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax_04FC4064D26B08873BB73C9A5F3696F8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_DAA192BC2D5BC1C3D2463C9A5F3696C5" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_87249830A7A864AAD92E3C9A5F3621B6" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_DAA192BC2D5BC1C3D2463C9A5F3696C5" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/InvestmentsContinuousLossPositionInvestmentsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_2702C75ED0F1F5B199DC0A343C95623C" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_5F26F50CCBD55146BF5F0A343C8BD1FA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_2702C75ED0F1F5B199DC0A343C95623C" xlink:to="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_5F26F50CCBD55146BF5F0A343C8BD1FA" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd#invest_InvestmentAxis" xlink:label="loc_invest_InvestmentAxis_3399034C2BDF85DD70550A343C8BDBFA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_5F26F50CCBD55146BF5F0A343C8BD1FA" xlink:to="loc_invest_InvestmentAxis_3399034C2BDF85DD70550A343C8BDBFA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd#invest_InvestmentDomain" xlink:label="loc_invest_InvestmentDomain_D6BF3A88714268A089F20A343C9549EA_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_invest_InvestmentAxis_3399034C2BDF85DD70550A343C8BDBFA" xlink:to="loc_invest_InvestmentDomain_D6BF3A88714268A089F20A343C9549EA_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd#invest_InvestmentDomain" xlink:label="loc_invest_InvestmentDomain_D6BF3A88714268A089F20A343C9549EA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_invest_InvestmentAxis_3399034C2BDF85DD70550A343C8BDBFA" xlink:to="loc_invest_InvestmentDomain_D6BF3A88714268A089F20A343C9549EA" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_RabbiTrustMember" xlink:label="loc_ipcc_RabbiTrustMember_EAAACB57294CC8B209340A343C957ACA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_invest_InvestmentDomain_D6BF3A88714268A089F20A343C9549EA" xlink:to="loc_ipcc_RabbiTrustMember_EAAACB57294CC8B209340A343C957ACA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_2F446DAD37E456D377C20A343C95C30B" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_5F26F50CCBD55146BF5F0A343C8BD1FA" xlink:to="loc_us-gaap_RangeAxis_2F446DAD37E456D377C20A343C95C30B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_E02F3BCBB8B84F93C4AE0A343C95BFCB_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_2F446DAD37E456D377C20A343C95C30B" xlink:to="loc_us-gaap_RangeMember_E02F3BCBB8B84F93C4AE0A343C95BFCB_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_E02F3BCBB8B84F93C4AE0A343C95BFCB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_2F446DAD37E456D377C20A343C95C30B" xlink:to="loc_us-gaap_RangeMember_E02F3BCBB8B84F93C4AE0A343C95BFCB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_BBA65D3B44DB4421D2960A343C950500" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_E02F3BCBB8B84F93C4AE0A343C95BFCB" xlink:to="loc_us-gaap_MaximumMember_BBA65D3B44DB4421D2960A343C950500" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_B7EEB8D167DF7E02EA990A343C95124A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_E02F3BCBB8B84F93C4AE0A343C95BFCB" xlink:to="loc_us-gaap_MinimumMember_B7EEB8D167DF7E02EA990A343C95124A" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_AgeOfUnrealizedLossAxis" xlink:label="loc_ipcc_AgeOfUnrealizedLossAxis_ABC07D51EBCF7FD61ED30A343C958640" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_5F26F50CCBD55146BF5F0A343C8BD1FA" xlink:to="loc_ipcc_AgeOfUnrealizedLossAxis_ABC07D51EBCF7FD61ED30A343C958640" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_AgeOfUnrealizedLossDomain" xlink:label="loc_ipcc_AgeOfUnrealizedLossDomain_D619B6C3AA6121D9A4240A343C952080_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ipcc_AgeOfUnrealizedLossAxis_ABC07D51EBCF7FD61ED30A343C958640" xlink:to="loc_ipcc_AgeOfUnrealizedLossDomain_D619B6C3AA6121D9A4240A343C952080_default" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_AgeOfUnrealizedLossDomain" xlink:label="loc_ipcc_AgeOfUnrealizedLossDomain_D619B6C3AA6121D9A4240A343C952080" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ipcc_AgeOfUnrealizedLossAxis_ABC07D51EBCF7FD61ED30A343C958640" xlink:to="loc_ipcc_AgeOfUnrealizedLossDomain_D619B6C3AA6121D9A4240A343C952080" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_LessThanTwelveMonthsMember" xlink:label="loc_ipcc_LessThanTwelveMonthsMember_0A5FE5AD7705715479D90A343C958D88" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipcc_AgeOfUnrealizedLossDomain_D619B6C3AA6121D9A4240A343C952080" xlink:to="loc_ipcc_LessThanTwelveMonthsMember_0A5FE5AD7705715479D90A343C958D88" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_GreaterThanTwelveMonthsMember" xlink:label="loc_ipcc_GreaterThanTwelveMonthsMember_1429720624034B4B2C330A343C9531B9" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipcc_AgeOfUnrealizedLossDomain_D619B6C3AA6121D9A4240A343C952080" xlink:to="loc_ipcc_GreaterThanTwelveMonthsMember_1429720624034B4B2C330A343C9531B9" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_A12MonthsormoreMember" xlink:label="loc_ipcc_A12MonthsormoreMember_A3EA1B0259748200B1800A343C955B3A" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipcc_AgeOfUnrealizedLossDomain_D619B6C3AA6121D9A4240A343C952080" xlink:to="loc_ipcc_A12MonthsormoreMember_A3EA1B0259748200B1800A343C955B3A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_D1743DB055FA45ED64530A343C95E810" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_5F26F50CCBD55146BF5F0A343C8BD1FA" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_D1743DB055FA45ED64530A343C95E810" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_4951560DFE686C25A1950A343C9576A1_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_D1743DB055FA45ED64530A343C95E810" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_4951560DFE686C25A1950A343C9576A1_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_4951560DFE686C25A1950A343C9576A1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_D1743DB055FA45ED64530A343C95E810" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_4951560DFE686C25A1950A343C9576A1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtSecuritiesMember" xlink:label="loc_us-gaap_DebtSecuritiesMember_D2DBFB02D6F8511640760A343C95A7D4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_4951560DFE686C25A1950A343C9576A1" xlink:to="loc_us-gaap_DebtSecuritiesMember_D2DBFB02D6F8511640760A343C95A7D4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_USGovernmentDebtSecuritiesMember" xlink:label="loc_us-gaap_USGovernmentDebtSecuritiesMember_B7A2FDC33766E3428C270A343C9561F6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_D2DBFB02D6F8511640760A343C95A7D4" xlink:to="loc_us-gaap_USGovernmentDebtSecuritiesMember_B7A2FDC33766E3428C270A343C9561F6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_96A9AB23C157912437870A343C95D71B" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_D2DBFB02D6F8511640760A343C95A7D4" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_96A9AB23C157912437870A343C95D71B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MortgageBackedSecuritiesMember" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_AA175A32806D57C011410A343C9532D3" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_D2DBFB02D6F8511640760A343C95A7D4" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_AA175A32806D57C011410A343C9532D3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_B929A7EFE73F19F2930C0A343C958C0A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MortgageBackedSecuritiesMember_AA175A32806D57C011410A343C9532D3" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_B929A7EFE73F19F2930C0A343C958C0A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_FF506650D3D0A4064F510A343C951049" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MortgageBackedSecuritiesMember_AA175A32806D57C011410A343C9532D3" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_FF506650D3D0A4064F510A343C951049" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember" xlink:label="loc_us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember_524A165CA1C50FF429D40A343C95D20F" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_D2DBFB02D6F8511640760A343C95A7D4" xlink:to="loc_us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember_524A165CA1C50FF429D40A343C95D20F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_5F0564415610440FD8240A343C95ADB6" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_D2DBFB02D6F8511640760A343C95A7D4" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_5F0564415610440FD8240A343C95ADB6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="loc_us-gaap_EquitySecuritiesMember_76A97BB35A54C4F4CEE50A343C95341D" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_4951560DFE686C25A1950A343C9576A1" xlink:to="loc_us-gaap_EquitySecuritiesMember_76A97BB35A54C4F4CEE50A343C95341D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShortTermInvestmentsMember" xlink:label="loc_us-gaap_ShortTermInvestmentsMember_73655BE1E4BD87BA28320A343C95C4D1" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_4951560DFE686C25A1950A343C9576A1" xlink:to="loc_us-gaap_ShortTermInvestmentsMember_73655BE1E4BD87BA28320A343C95C4D1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear_B292559A37086497996C0A343C95A841" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_2702C75ED0F1F5B199DC0A343C95623C" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear_B292559A37086497996C0A343C95A841" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue_85526A5633F4AFCFDDA40A343C951577" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_2702C75ED0F1F5B199DC0A343C95623C" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue_85526A5633F4AFCFDDA40A343C951577" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_8C1878D0AB7B3A2AC8110A79B714FDAE" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_2702C75ED0F1F5B199DC0A343C95623C" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_8C1878D0AB7B3A2AC8110A79B714FDAE" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_UnrealizedLossesAsPercentageOfCost" xlink:label="loc_ipcc_UnrealizedLossesAsPercentageOfCost_2B62C6247CF34AA004F00A343C95FC23" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_2702C75ED0F1F5B199DC0A343C95623C" xlink:to="loc_ipcc_UnrealizedLossesAsPercentageOfCost_2B62C6247CF34AA004F00A343C95FC23" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1" xlink:label="loc_us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1_330DF499C61944EC38870A343C95822D" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_2702C75ED0F1F5B199DC0A343C95623C" xlink:to="loc_us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1_330DF499C61944EC38870A343C95822D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear" xlink:label="loc_us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear_11488607289547376DF30A343C958E14" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_2702C75ED0F1F5B199DC0A343C95623C" xlink:to="loc_us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear_11488607289547376DF30A343C958E14" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_5DE0F2BA44623B4538F60A343C9589B0" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_2702C75ED0F1F5B199DC0A343C95623C" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_5DE0F2BA44623B4538F60A343C9589B0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_0BD46393DEADCB7C12460A7BBF4FC705" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_2702C75ED0F1F5B199DC0A343C95623C" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_0BD46393DEADCB7C12460A7BBF4FC705" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_ThresholdForImpairmentEvaluationPercentageOfBookValue" xlink:label="loc_ipcc_ThresholdForImpairmentEvaluationPercentageOfBookValue_7A4B65A0AC53E31A04CE0A343C954FFA" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_2702C75ED0F1F5B199DC0A343C95623C" xlink:to="loc_ipcc_ThresholdForImpairmentEvaluationPercentageOfBookValue_7A4B65A0AC53E31A04CE0A343C954FFA" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_ThresholdForImpairmentEvaluationUnrealizedLossAmount" xlink:label="loc_ipcc_ThresholdForImpairmentEvaluationUnrealizedLossAmount_991AF83504B340CA9ABD0A343C95B748" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_2702C75ED0F1F5B199DC0A343C95623C" xlink:to="loc_ipcc_ThresholdForImpairmentEvaluationUnrealizedLossAmount_991AF83504B340CA9ABD0A343C95B748" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/InvestmentsCreditLossesRollforwardDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/InvestmentsInvestmentIncomeDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/InvestmentsInvestmentsByContractualMaturityDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_D671DA938C63A885BB883C9E7A03539F" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_6969CB1931EA0E6068C03C9E7A02F4B5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_D671DA938C63A885BB883C9E7A03539F" xlink:to="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_6969CB1931EA0E6068C03C9E7A02F4B5" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_InvestmentsByUnrealizedGainOrLossPositionAxis" xlink:label="loc_ipcc_InvestmentsByUnrealizedGainOrLossPositionAxis_CD0DE520AB95E3D55EFB3C9E7A03B27F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_6969CB1931EA0E6068C03C9E7A02F4B5" xlink:to="loc_ipcc_InvestmentsByUnrealizedGainOrLossPositionAxis_CD0DE520AB95E3D55EFB3C9E7A03B27F" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_InvestmentsByUnrealizedGainOrLossPositionDomain" xlink:label="loc_ipcc_InvestmentsByUnrealizedGainOrLossPositionDomain_D9CFED0E50994D69E7C03C9E7A03E1C3_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ipcc_InvestmentsByUnrealizedGainOrLossPositionAxis_CD0DE520AB95E3D55EFB3C9E7A03B27F" xlink:to="loc_ipcc_InvestmentsByUnrealizedGainOrLossPositionDomain_D9CFED0E50994D69E7C03C9E7A03E1C3_default" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_InvestmentsByUnrealizedGainOrLossPositionDomain" xlink:label="loc_ipcc_InvestmentsByUnrealizedGainOrLossPositionDomain_D9CFED0E50994D69E7C03C9E7A03E1C3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ipcc_InvestmentsByUnrealizedGainOrLossPositionAxis_CD0DE520AB95E3D55EFB3C9E7A03B27F" xlink:to="loc_ipcc_InvestmentsByUnrealizedGainOrLossPositionDomain_D9CFED0E50994D69E7C03C9E7A03E1C3" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_SecuritiesWithUnrealizedGainsMember" xlink:label="loc_ipcc_SecuritiesWithUnrealizedGainsMember_10D29E7C2D518BD54BD33C9E7A0398FD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipcc_InvestmentsByUnrealizedGainOrLossPositionDomain_D9CFED0E50994D69E7C03C9E7A03E1C3" xlink:to="loc_ipcc_SecuritiesWithUnrealizedGainsMember_10D29E7C2D518BD54BD33C9E7A0398FD" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_SecuritiesWithUnrealizedLossesMember" xlink:label="loc_ipcc_SecuritiesWithUnrealizedLossesMember_60707534A75576D059D33C9E7A03EF42" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipcc_InvestmentsByUnrealizedGainOrLossPositionDomain_D9CFED0E50994D69E7C03C9E7A03E1C3" xlink:to="loc_ipcc_SecuritiesWithUnrealizedLossesMember_60707534A75576D059D33C9E7A03EF42" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_SecuritiesWithNoUnrealizedGainsOrLossesMember" xlink:label="loc_ipcc_SecuritiesWithNoUnrealizedGainsOrLossesMember_DF5C66E5B9A6E4AFFFEC3C9E7A0337D2" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipcc_InvestmentsByUnrealizedGainOrLossPositionDomain_D9CFED0E50994D69E7C03C9E7A03E1C3" xlink:to="loc_ipcc_SecuritiesWithNoUnrealizedGainsOrLossesMember_DF5C66E5B9A6E4AFFFEC3C9E7A0337D2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_60011B226201F6D7DEFF3C9E7A0467DA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_D671DA938C63A885BB883C9E7A03539F" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_60011B226201F6D7DEFF3C9E7A0467DA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_2663D9E28E3C80CAA26E3C9E7A0486F9" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_D671DA938C63A885BB883C9E7A03539F" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_2663D9E28E3C80CAA26E3C9E7A0486F9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_C6CDBFFACA8163977D6A3C9E7A049132" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_D671DA938C63A885BB883C9E7A03539F" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_C6CDBFFACA8163977D6A3C9E7A049132" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_EA3BCBE74569F0BD140E3C9E7A04129A" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_D671DA938C63A885BB883C9E7A03539F" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_EA3BCBE74569F0BD140E3C9E7A04129A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_0C7E5A2ECE805C7A15853C9E7A0402A0" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_D671DA938C63A885BB883C9E7A03539F" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_0C7E5A2ECE805C7A15853C9E7A0402A0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_4C2A8926E3D28ED4E98A3C9E7A04622B" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_D671DA938C63A885BB883C9E7A03539F" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_4C2A8926E3D28ED4E98A3C9E7A04622B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_C725FA2C805F90787E383C9E7A09BD0F" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_D671DA938C63A885BB883C9E7A03539F" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_C725FA2C805F90787E383C9E7A09BD0F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_37E545F431BEAE8DE7963C9E7A096A3E" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_D671DA938C63A885BB883C9E7A03539F" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_37E545F431BEAE8DE7963C9E7A096A3E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_FA40025B797200FB2A993C9E7A0A3982" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_D671DA938C63A885BB883C9E7A03539F" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_FA40025B797200FB2A993C9E7A0A3982" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_CDAEE4EC89C12FB155243C9E7A0A37B1" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_D671DA938C63A885BB883C9E7A03539F" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_CDAEE4EC89C12FB155243C9E7A0A37B1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_07C370CE8A10A0E77E723C9E7A0A38B9" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_D671DA938C63A885BB883C9E7A03539F" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_07C370CE8A10A0E77E723C9E7A0A38B9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_0B2E68D25CA0B9ACA8C23C9E7A0A3117" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_D671DA938C63A885BB883C9E7A03539F" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_0B2E68D25CA0B9ACA8C23C9E7A0A3117" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/InvestmentsInvestmentsByMajorCategoryDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_31B51B3ADD56C8C9F1D20A58C9D635C7" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_BDC1A3B52E7A8B8677E70A58C9D6B86B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_31B51B3ADD56C8C9F1D20A58C9D635C7" xlink:to="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_BDC1A3B52E7A8B8677E70A58C9D6B86B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_CC4B43223B8A655B0E7C0A58C9D66BFD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_BDC1A3B52E7A8B8677E70A58C9D6B86B" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_CC4B43223B8A655B0E7C0A58C9D66BFD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_15459F6A2714CA5474020A58C9D6EF6D_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_CC4B43223B8A655B0E7C0A58C9D66BFD" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_15459F6A2714CA5474020A58C9D6EF6D_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_15459F6A2714CA5474020A58C9D6EF6D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_CC4B43223B8A655B0E7C0A58C9D66BFD" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_15459F6A2714CA5474020A58C9D6EF6D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtSecuritiesMember" xlink:label="loc_us-gaap_DebtSecuritiesMember_F417ACB45DB4DCA33F740A58C9D689DB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_15459F6A2714CA5474020A58C9D6EF6D" xlink:to="loc_us-gaap_DebtSecuritiesMember_F417ACB45DB4DCA33F740A58C9D689DB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_USGovernmentDebtSecuritiesMember" xlink:label="loc_us-gaap_USGovernmentDebtSecuritiesMember_913600B7E72A53E80D940A58C9D6A12A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_F417ACB45DB4DCA33F740A58C9D689DB" xlink:to="loc_us-gaap_USGovernmentDebtSecuritiesMember_913600B7E72A53E80D940A58C9D6A12A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_DD322CD6572079F400570A58C9D62A98" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_F417ACB45DB4DCA33F740A58C9D689DB" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_DD322CD6572079F400570A58C9D62A98" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MortgageBackedSecuritiesMember" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_0ABF1197D49946820D1B0A58C9D63D95" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_F417ACB45DB4DCA33F740A58C9D689DB" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_0ABF1197D49946820D1B0A58C9D63D95" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_BC83A32C217345A192EE0A58C9D689BD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MortgageBackedSecuritiesMember_0ABF1197D49946820D1B0A58C9D63D95" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_BC83A32C217345A192EE0A58C9D689BD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_184F48A4CC964FB3B8DF0A58C9D63D77" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MortgageBackedSecuritiesMember_0ABF1197D49946820D1B0A58C9D63D95" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_184F48A4CC964FB3B8DF0A58C9D63D77" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CollateralizedDebtObligationsMember" xlink:label="loc_us-gaap_CollateralizedDebtObligationsMember_C7C8F6274A3B9408F0950A58C9D67392" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_F417ACB45DB4DCA33F740A58C9D689DB" xlink:to="loc_us-gaap_CollateralizedDebtObligationsMember_C7C8F6274A3B9408F0950A58C9D67392" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember" xlink:label="loc_us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember_B90F1B3F5C26566029100A58C9D66DE8" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_F417ACB45DB4DCA33F740A58C9D689DB" xlink:to="loc_us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember_B90F1B3F5C26566029100A58C9D66DE8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_A32414E72D903816B68E0A58C9D6B8DB" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesMember_F417ACB45DB4DCA33F740A58C9D689DB" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_A32414E72D903816B68E0A58C9D6B8DB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="loc_us-gaap_EquitySecuritiesMember_46FCC8485F0BBE49EB7E0A58C9D6161A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_15459F6A2714CA5474020A58C9D6EF6D" xlink:to="loc_us-gaap_EquitySecuritiesMember_46FCC8485F0BBE49EB7E0A58C9D6161A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShortTermInvestmentsMember" xlink:label="loc_us-gaap_ShortTermInvestmentsMember_52A94D4AC9A0E925BDB80A58C9D649D1" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_15459F6A2714CA5474020A58C9D6EF6D" xlink:to="loc_us-gaap_ShortTermInvestmentsMember_52A94D4AC9A0E925BDB80A58C9D649D1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesAmortizedCost_CADBAFBC43E3639748CD0A58C9D6C728" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_31B51B3ADD56C8C9F1D20A58C9D635C7" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesAmortizedCost_CADBAFBC43E3639748CD0A58C9D6C728" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_BC34CDA5BD4B17F6459A0A58C9D61B8F" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_31B51B3ADD56C8C9F1D20A58C9D635C7" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_BC34CDA5BD4B17F6459A0A58C9D61B8F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_C59E9B2F81B08EB0C2E10A58C9D6E9CF" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_31B51B3ADD56C8C9F1D20A58C9D635C7" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_C59E9B2F81B08EB0C2E10A58C9D6E9CF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecurities_B6068955C5477F9AD00E0A5BF1140F0C" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_31B51B3ADD56C8C9F1D20A58C9D635C7" xlink:to="loc_us-gaap_AvailableForSaleSecurities_B6068955C5477F9AD00E0A5BF1140F0C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities_FA502D9637C2D8E0AD980A58C9D6402B" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_31B51B3ADD56C8C9F1D20A58C9D635C7" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities_FA502D9637C2D8E0AD980A58C9D6402B" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/InvestmentsSummaryOfUnrealizedGainsAndLossesDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/InvestmentsTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/InvestmentsTextualDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_D19CCBBFEFDAF1E274983C9A5EE8DAC7" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_7AAA7F7E6BF4C013C4B93C9A5EE87E59" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_D19CCBBFEFDAF1E274983C9A5EE8DAC7" xlink:to="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_7AAA7F7E6BF4C013C4B93C9A5EE87E59" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd#invest_InvestmentAxis" xlink:label="loc_invest_InvestmentAxis_9E1AA89E5B57B9EBC73D3C9A5EE8D55C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_7AAA7F7E6BF4C013C4B93C9A5EE87E59" xlink:to="loc_invest_InvestmentAxis_9E1AA89E5B57B9EBC73D3C9A5EE8D55C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd#invest_InvestmentDomain" xlink:label="loc_invest_InvestmentDomain_65EAA8BCB851ADA1288C3C9A5EE8E1A7_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_invest_InvestmentAxis_9E1AA89E5B57B9EBC73D3C9A5EE8D55C" xlink:to="loc_invest_InvestmentDomain_65EAA8BCB851ADA1288C3C9A5EE8E1A7_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd#invest_InvestmentDomain" xlink:label="loc_invest_InvestmentDomain_65EAA8BCB851ADA1288C3C9A5EE8E1A7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_invest_InvestmentAxis_9E1AA89E5B57B9EBC73D3C9A5EE8D55C" xlink:to="loc_invest_InvestmentDomain_65EAA8BCB851ADA1288C3C9A5EE8E1A7" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_RabbiTrustMember" xlink:label="loc_ipcc_RabbiTrustMember_8D4222D688AAC0D8F35C3C9A5EE821FF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_invest_InvestmentDomain_65EAA8BCB851ADA1288C3C9A5EE8E1A7" xlink:to="loc_ipcc_RabbiTrustMember_8D4222D688AAC0D8F35C3C9A5EE821FF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities" xlink:label="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities_6AB0ACE1053C35BA04763C9A5EE87AB2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_D19CCBBFEFDAF1E274983C9A5EE8DAC7" xlink:to="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities_6AB0ACE1053C35BA04763C9A5EE87AB2" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_ReceivableForInvestmentsSold" xlink:label="loc_ipcc_ReceivableForInvestmentsSold_67106BAB9DB1635BFDF13C9A5EE86628" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_D19CCBBFEFDAF1E274983C9A5EE8DAC7" xlink:to="loc_ipcc_ReceivableForInvestmentsSold_67106BAB9DB1635BFDF13C9A5EE86628" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesGrossRealizedGains" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesGrossRealizedGains_850504361BEECD8EBAAC3C9A5EE817C6" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_D19CCBBFEFDAF1E274983C9A5EE8DAC7" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesGrossRealizedGains_850504361BEECD8EBAAC3C9A5EE817C6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses_4C60A6A2F323E6155E723C9A5EE81EAA" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_D19CCBBFEFDAF1E274983C9A5EE8DAC7" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses_4C60A6A2F323E6155E723C9A5EE81EAA" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/InvestmentsUnrealizedLossesByAgeAndSeverityDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_952E307D7E28C903129E0A343C773758" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_0EE80A6C9DBBB86817E10A343C77EB24" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_952E307D7E28C903129E0A343C773758" xlink:to="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_0EE80A6C9DBBB86817E10A343C77EB24" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_SeverityOfUnrealizedLossAxis" xlink:label="loc_ipcc_SeverityOfUnrealizedLossAxis_0E1EF6BC5B66188C16BD0A343C77D33B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_0EE80A6C9DBBB86817E10A343C77EB24" xlink:to="loc_ipcc_SeverityOfUnrealizedLossAxis_0E1EF6BC5B66188C16BD0A343C77D33B" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_SeverityOfUnrealizedLossDomain" xlink:label="loc_ipcc_SeverityOfUnrealizedLossDomain_FB76A474D384F749B5C90A343C773571_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ipcc_SeverityOfUnrealizedLossAxis_0E1EF6BC5B66188C16BD0A343C77D33B" xlink:to="loc_ipcc_SeverityOfUnrealizedLossDomain_FB76A474D384F749B5C90A343C773571_default" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_SeverityOfUnrealizedLossDomain" xlink:label="loc_ipcc_SeverityOfUnrealizedLossDomain_FB76A474D384F749B5C90A343C773571" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ipcc_SeverityOfUnrealizedLossAxis_0E1EF6BC5B66188C16BD0A343C77D33B" xlink:to="loc_ipcc_SeverityOfUnrealizedLossDomain_FB76A474D384F749B5C90A343C773571" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_LessThanFivePercentAsPercentageOfAmortizedCostOrCostMember" xlink:label="loc_ipcc_LessThanFivePercentAsPercentageOfAmortizedCostOrCostMember_0609E26E6F6DBBECC1680A343C7784BE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipcc_SeverityOfUnrealizedLossDomain_FB76A474D384F749B5C90A343C773571" xlink:to="loc_ipcc_LessThanFivePercentAsPercentageOfAmortizedCostOrCostMember_0609E26E6F6DBBECC1680A343C7784BE" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_BetweenFivePercentAndTenPercentAsPercentageOfAmortizedCostOrCostMember" xlink:label="loc_ipcc_BetweenFivePercentAndTenPercentAsPercentageOfAmortizedCostOrCostMember_DB0A8491298E3EAC95B00A343C777223" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipcc_SeverityOfUnrealizedLossDomain_FB76A474D384F749B5C90A343C773571" xlink:to="loc_ipcc_BetweenFivePercentAndTenPercentAsPercentageOfAmortizedCostOrCostMember_DB0A8491298E3EAC95B00A343C777223" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_GreaterThanTenPercentAsPercentageOfAmortizedCostOrCostMember" xlink:label="loc_ipcc_GreaterThanTenPercentAsPercentageOfAmortizedCostOrCostMember_CF80F6ECB53B2CA688710A343C771BFE" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipcc_SeverityOfUnrealizedLossDomain_FB76A474D384F749B5C90A343C773571" xlink:to="loc_ipcc_GreaterThanTenPercentAsPercentageOfAmortizedCostOrCostMember_CF80F6ECB53B2CA688710A343C771BFE" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_AgeOfUnrealizedLossAxis" xlink:label="loc_ipcc_AgeOfUnrealizedLossAxis_B983790FDB226857DCAF0A343C77EA3F" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_0EE80A6C9DBBB86817E10A343C77EB24" xlink:to="loc_ipcc_AgeOfUnrealizedLossAxis_B983790FDB226857DCAF0A343C77EA3F" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_AgeOfUnrealizedLossDomain" xlink:label="loc_ipcc_AgeOfUnrealizedLossDomain_590D975C7675FF4C4F780A343C77FD02_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ipcc_AgeOfUnrealizedLossAxis_B983790FDB226857DCAF0A343C77EA3F" xlink:to="loc_ipcc_AgeOfUnrealizedLossDomain_590D975C7675FF4C4F780A343C77FD02_default" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_AgeOfUnrealizedLossDomain" xlink:label="loc_ipcc_AgeOfUnrealizedLossDomain_590D975C7675FF4C4F780A343C77FD02" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ipcc_AgeOfUnrealizedLossAxis_B983790FDB226857DCAF0A343C77EA3F" xlink:to="loc_ipcc_AgeOfUnrealizedLossDomain_590D975C7675FF4C4F780A343C77FD02" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_ZeroToThreeMonthsMember" xlink:label="loc_ipcc_ZeroToThreeMonthsMember_DD2C31276AE40DE831DB0A343C77EDAA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipcc_AgeOfUnrealizedLossDomain_590D975C7675FF4C4F780A343C77FD02" xlink:to="loc_ipcc_ZeroToThreeMonthsMember_DD2C31276AE40DE831DB0A343C77EDAA" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_ThreeToSixMonthsMember" xlink:label="loc_ipcc_ThreeToSixMonthsMember_159D1467A3F5D50334E00A343C77DBB6" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipcc_AgeOfUnrealizedLossDomain_590D975C7675FF4C4F780A343C77FD02" xlink:to="loc_ipcc_ThreeToSixMonthsMember_159D1467A3F5D50334E00A343C77DBB6" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_SixToNineMonthsMember" xlink:label="loc_ipcc_SixToNineMonthsMember_184D51A88C7C3E08023F0A343C779BA9" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipcc_AgeOfUnrealizedLossDomain_590D975C7675FF4C4F780A343C77FD02" xlink:to="loc_ipcc_SixToNineMonthsMember_184D51A88C7C3E08023F0A343C779BA9" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_NineToTwelveMonthsMember" xlink:label="loc_ipcc_NineToTwelveMonthsMember_BD76E2E2A5591B53DEA00A343C773C6D" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipcc_AgeOfUnrealizedLossDomain_590D975C7675FF4C4F780A343C77FD02" xlink:to="loc_ipcc_NineToTwelveMonthsMember_BD76E2E2A5591B53DEA00A343C773C6D" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_GreaterThanTwelveMonthsMember" xlink:label="loc_ipcc_GreaterThanTwelveMonthsMember_0A18B62237A48656A8580A343C775BA6" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipcc_AgeOfUnrealizedLossDomain_590D975C7675FF4C4F780A343C77FD02" xlink:to="loc_ipcc_GreaterThanTwelveMonthsMember_0A18B62237A48656A8580A343C775BA6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue_FA764ED1E177167F6AA00A343C7739E8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_952E307D7E28C903129E0A343C773758" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue_FA764ED1E177167F6AA00A343C7739E8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_FE532591E87EDE8CECE80A343C77F48E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_952E307D7E28C903129E0A343C773758" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_FE532591E87EDE8CECE80A343C77F48E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue_DBD1AC8FB42CBB580C620A343C81161C" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_952E307D7E28C903129E0A343C773758" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue_DBD1AC8FB42CBB580C620A343C81161C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_9212A0C9557AE30CD7980A756DA9FD50" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_952E307D7E28C903129E0A343C773758" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_9212A0C9557AE30CD7980A756DA9FD50" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_0B42582D9CEE5B093E1A0A761EC9032F" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_952E307D7E28C903129E0A343C773758" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_0B42582D9CEE5B093E1A0A761EC9032F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_B3AF6074DE08ADC523300A76992801BA" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_952E307D7E28C903129E0A343C773758" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_B3AF6074DE08ADC523300A76992801BA" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/LegalAndRegulatoryProceedings" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/LongTermDebt" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/LongTermDebtDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_FDBC25A301FC4B9829A6F4F6CF2E7FF9" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_AC36065ECF3463F833F4F4F6CF2D48C8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FDBC25A301FC4B9829A6F4F6CF2E7FF9" xlink:to="loc_us-gaap_DebtInstrumentTable_AC36065ECF3463F833F4F4F6CF2D48C8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_1FFBE276EC9C97E84443F4F6CF2E2C81" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_AC36065ECF3463F833F4F4F6CF2D48C8" xlink:to="loc_us-gaap_DebtInstrumentAxis_1FFBE276EC9C97E84443F4F6CF2E2C81" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_F90C04866B6C7FD8756CF4F6CF2E9780_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_1FFBE276EC9C97E84443F4F6CF2E2C81" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_F90C04866B6C7FD8756CF4F6CF2E9780_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_F90C04866B6C7FD8756CF4F6CF2E9780" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_1FFBE276EC9C97E84443F4F6CF2E2C81" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_F90C04866B6C7FD8756CF4F6CF2E9780" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_SeniorNotesDue2022Member" xlink:label="loc_ipcc_SeniorNotesDue2022Member_E95771855AED32B12CE9F4F6CF2EABA5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F90C04866B6C7FD8756CF4F6CF2E9780" xlink:to="loc_ipcc_SeniorNotesDue2022Member_E95771855AED32B12CE9F4F6CF2EABA5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_077B22A6662DBA0FBDBDF4F6CF2E2A0D" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_AC36065ECF3463F833F4F4F6CF2D48C8" xlink:to="loc_us-gaap_CreditFacilityAxis_077B22A6662DBA0FBDBDF4F6CF2E2A0D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_88695B985C8DBC78AB02F4F6CF2E252E_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_077B22A6662DBA0FBDBDF4F6CF2E2A0D" xlink:to="loc_us-gaap_CreditFacilityDomain_88695B985C8DBC78AB02F4F6CF2E252E_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_88695B985C8DBC78AB02F4F6CF2E252E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_077B22A6662DBA0FBDBDF4F6CF2E2A0D" xlink:to="loc_us-gaap_CreditFacilityDomain_88695B985C8DBC78AB02F4F6CF2E252E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_5561144F60FA82641BA4F4F6CF2EE78B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_88695B985C8DBC78AB02F4F6CF2E252E" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_5561144F60FA82641BA4F4F6CF2EE78B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_9780B120306AF31E83ADF4F6CF2EB175" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_AC36065ECF3463F833F4F4F6CF2D48C8" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_9780B120306AF31E83ADF4F6CF2EB175" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_B3A8F34ED17FF82BB457F4F6CF2E6BDB_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_9780B120306AF31E83ADF4F6CF2EB175" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_B3A8F34ED17FF82BB457F4F6CF2E6BDB_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_B3A8F34ED17FF82BB457F4F6CF2E6BDB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_9780B120306AF31E83ADF4F6CF2EB175" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_B3A8F34ED17FF82BB457F4F6CF2E6BDB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="loc_us-gaap_SeniorNotesMember_042B16CEA464A8D459DAF4F6CF2E2D60" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_B3A8F34ED17FF82BB457F4F6CF2E6BDB" xlink:to="loc_us-gaap_SeniorNotesMember_042B16CEA464A8D459DAF4F6CF2E2D60" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_481867DF64A59C47AD2DF4F6CF2EB1CC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FDBC25A301FC4B9829A6F4F6CF2E7FF9" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_481867DF64A59C47AD2DF4F6CF2EB1CC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_ED90AA3B3D5B97A54E24F4F6CF2F8C66" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FDBC25A301FC4B9829A6F4F6CF2E7FF9" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_ED90AA3B3D5B97A54E24F4F6CF2F8C66" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtIssuanceCosts" xlink:label="loc_us-gaap_DebtIssuanceCosts_E43B5ED9B4C282AA5908F4F6CF2F0552" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FDBC25A301FC4B9829A6F4F6CF2E7FF9" xlink:to="loc_us-gaap_DebtIssuanceCosts_E43B5ED9B4C282AA5908F4F6CF2F0552" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NotesPayableFairValueDisclosure" xlink:label="loc_us-gaap_NotesPayableFairValueDisclosure_3F28EAA8399D2CDEA3BCF4F6CF2FE35A" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FDBC25A301FC4B9829A6F4F6CF2E7FF9" xlink:to="loc_us-gaap_NotesPayableFairValueDisclosure_3F28EAA8399D2CDEA3BCF4F6CF2FE35A" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_FairValueDebtInstrumentValuationBasisSpread" xlink:label="loc_ipcc_FairValueDebtInstrumentValuationBasisSpread_823759163D397A2AD952F4F6CF2FA43A" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FDBC25A301FC4B9829A6F4F6CF2E7FF9" xlink:to="loc_ipcc_FairValueDebtInstrumentValuationBasisSpread_823759163D397A2AD952F4F6CF2FA43A" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_FairValueDebtInstrumentValuationBasisUsTreasuryNoteRate" xlink:label="loc_ipcc_FairValueDebtInstrumentValuationBasisUsTreasuryNoteRate_DD883BDEF2DFBE2D68C2F4F6CF2F34B1" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FDBC25A301FC4B9829A6F4F6CF2E7FF9" xlink:to="loc_ipcc_FairValueDebtInstrumentValuationBasisUsTreasuryNoteRate_DD883BDEF2DFBE2D68C2F4F6CF2F34B1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InterestPaid" xlink:label="loc_us-gaap_InterestPaid_76DA167F1B85B0FB6C79F4F6CF2F2FCB" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FDBC25A301FC4B9829A6F4F6CF2E7FF9" xlink:to="loc_us-gaap_InterestPaid_76DA167F1B85B0FB6C79F4F6CF2F2FCB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_6FEE2227DA4C4580FDE4F4F6CF2FD52C" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FDBC25A301FC4B9829A6F4F6CF2E7FF9" xlink:to="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_6FEE2227DA4C4580FDE4F4F6CF2FD52C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentTerm" xlink:label="loc_us-gaap_DebtInstrumentTerm_4D0FEA7E19F70C327D7FF4F6CF2F9EEE" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FDBC25A301FC4B9829A6F4F6CF2E7FF9" xlink:to="loc_us-gaap_DebtInstrumentTerm_4D0FEA7E19F70C327D7FF4F6CF2F9EEE" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/QuarterlyOperatingResultsDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/QuarterlyOperatingResultsTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/QuarterlyOperatingResultsUnaudited" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/QuarterlyOperatingResultsUnauditedPriorPeriodAdjustmentsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems" xlink:label="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_02965CFB0ED5078F8594F5073141A629" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable" xlink:label="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_34D17B5989950EB7CE45F5073132B657" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_02965CFB0ED5078F8594F5073141A629" xlink:to="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_34D17B5989950EB7CE45F5073132B657" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_2B94095DF380C9B2CD89F50731320574" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_34D17B5989950EB7CE45F5073132B657" xlink:to="loc_us-gaap_StatementScenarioAxis_2B94095DF380C9B2CD89F50731320574" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_D791AEB87585B43DDF91F507313246AD_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_2B94095DF380C9B2CD89F50731320574" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_D791AEB87585B43DDF91F507313246AD_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_D791AEB87585B43DDF91F507313246AD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_2B94095DF380C9B2CD89F50731320574" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_D791AEB87585B43DDF91F507313246AD" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_Ipcc_InstallmentandOtherFeeIncome" xlink:label="loc_ipcc_Ipcc_InstallmentandOtherFeeIncome_531DB95437DE56DCAB25F5073141874A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_02965CFB0ED5078F8594F5073141A629" xlink:to="loc_ipcc_Ipcc_InstallmentandOtherFeeIncome_531DB95437DE56DCAB25F5073141874A" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/Reinsurance" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/ReinsuranceNarrativeDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems" xlink:label="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems_3A7325C8D213E0E5B998155A9CED95FD" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentTable" xlink:label="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentTable_3EB0621C48D528AFCB31155A9CE33FCC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems_3A7325C8D213E0E5B998155A9CED95FD" xlink:to="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentTable_3EB0621C48D528AFCB31155A9CE33FCC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_59633D441CA50D2C831A155A9CE39A46" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentTable_3EB0621C48D528AFCB31155A9CE33FCC" xlink:to="loc_us-gaap_StatementScenarioAxis_59633D441CA50D2C831A155A9CE39A46" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_C8359AF3B6E9DCDCC658155A9CE302F9_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_59633D441CA50D2C831A155A9CE39A46" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_C8359AF3B6E9DCDCC658155A9CE302F9_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_C8359AF3B6E9DCDCC658155A9CE302F9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_59633D441CA50D2C831A155A9CE39A46" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_C8359AF3B6E9DCDCC658155A9CE302F9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioForecastMember" xlink:label="loc_us-gaap_ScenarioForecastMember_BFF62A8BD48AFA550B1E155A9CE3DCDA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScenarioUnspecifiedDomain_C8359AF3B6E9DCDCC658155A9CE302F9" xlink:to="loc_us-gaap_ScenarioForecastMember_BFF62A8BD48AFA550B1E155A9CE3DCDA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_183DBE03A6AA5334740F155A9CE3A732" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentTable_3EB0621C48D528AFCB31155A9CE33FCC" xlink:to="loc_us-gaap_RangeAxis_183DBE03A6AA5334740F155A9CE3A732" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_8133F52195C44D6432A1155A9CE33A54_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_183DBE03A6AA5334740F155A9CE3A732" xlink:to="loc_us-gaap_RangeMember_8133F52195C44D6432A1155A9CE33A54_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_8133F52195C44D6432A1155A9CE33A54" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_183DBE03A6AA5334740F155A9CE3A732" xlink:to="loc_us-gaap_RangeMember_8133F52195C44D6432A1155A9CE33A54" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_58E54CCDE68E4170C0BC155A9CE3AA30" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_8133F52195C44D6432A1155A9CE33A54" xlink:to="loc_us-gaap_MaximumMember_58E54CCDE68E4170C0BC155A9CE3AA30" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis" xlink:label="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis_11ADF9A06546927290A5155A9CE33E2D" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentTable_3EB0621C48D528AFCB31155A9CE33FCC" xlink:to="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis_11ADF9A06546927290A5155A9CE33E2D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentDomain" xlink:label="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentDomain_A804448A0779A68E16E0155A9CEDA7EB_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis_11ADF9A06546927290A5155A9CE33E2D" xlink:to="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentDomain_A804448A0779A68E16E0155A9CEDA7EB_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentDomain" xlink:label="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentDomain_A804448A0779A68E16E0155A9CEDA7EB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis_11ADF9A06546927290A5155A9CE33E2D" xlink:to="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentDomain_A804448A0779A68E16E0155A9CEDA7EB" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_ExtraContractualLossReinsuranceMember" xlink:label="loc_ipcc_ExtraContractualLossReinsuranceMember_A7005D35A0B1F46E8393155A9CED1309" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentDomain_A804448A0779A68E16E0155A9CEDA7EB" xlink:to="loc_ipcc_ExtraContractualLossReinsuranceMember_A7005D35A0B1F46E8393155A9CED1309" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_PersonalAutoInsuranceMember" xlink:label="loc_ipcc_PersonalAutoInsuranceMember_9D1FF614DA4CD8071709155A9CED1C5F" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentDomain_A804448A0779A68E16E0155A9CEDA7EB" xlink:to="loc_ipcc_PersonalAutoInsuranceMember_9D1FF614DA4CD8071709155A9CED1C5F" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_GreatAmericanInsuranceMember" xlink:label="loc_ipcc_GreatAmericanInsuranceMember_4C739A3FEE38AF90DA63155A9CED338D" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentDomain_A804448A0779A68E16E0155A9CEDA7EB" xlink:to="loc_ipcc_GreatAmericanInsuranceMember_4C739A3FEE38AF90DA63155A9CED338D" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_InvoluntaryPoolsAndAssociationsMember" xlink:label="loc_ipcc_InvoluntaryPoolsAndAssociationsMember_50ABB90B33CE194D81D7155A9CED649C" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentDomain_A804448A0779A68E16E0155A9CEDA7EB" xlink:to="loc_ipcc_InvoluntaryPoolsAndAssociationsMember_50ABB90B33CE194D81D7155A9CED649C" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_CommercialAutoInsuranceMember" xlink:label="loc_ipcc_CommercialAutoInsuranceMember_BE1CE65EFEC8BB8A7812155A9CED571E" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentDomain_A804448A0779A68E16E0155A9CEDA7EB" xlink:to="loc_ipcc_CommercialAutoInsuranceMember_BE1CE65EFEC8BB8A7812155A9CED571E" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_ReinsurancePremiumsForInsuranceCompaniesDirectWrittenPremiumAmountAssumedFromOtherCompanies" xlink:label="loc_ipcc_ReinsurancePremiumsForInsuranceCompaniesDirectWrittenPremiumAmountAssumedFromOtherCompanies_2BE263AF453D752ED161155A9CED9A64" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems_3A7325C8D213E0E5B998155A9CED95FD" xlink:to="loc_ipcc_ReinsurancePremiumsForInsuranceCompaniesDirectWrittenPremiumAmountAssumedFromOtherCompanies_2BE263AF453D752ED161155A9CED9A64" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssumedLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense" xlink:label="loc_us-gaap_AssumedLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense_8AD3839D466A56D1C2FE155A9CEDBDE2" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems_3A7325C8D213E0E5B998155A9CED95FD" xlink:to="loc_us-gaap_AssumedLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense_8AD3839D466A56D1C2FE155A9CEDBDE2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssumedPremiumsEarned" xlink:label="loc_us-gaap_AssumedPremiumsEarned_0DE655E9BC1B09BE0432155A9CED92C4" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems_3A7325C8D213E0E5B998155A9CED95FD" xlink:to="loc_us-gaap_AssumedPremiumsEarned_0DE655E9BC1B09BE0432155A9CED92C4" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_CatastropheReinsuranceAdditionalCoverageThirdPartyRecoveryPercentage" xlink:label="loc_ipcc_CatastropheReinsuranceAdditionalCoverageThirdPartyRecoveryPercentage_8C9B5A7065814EE5831E155A9CED3DAA" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems_3A7325C8D213E0E5B998155A9CED95FD" xlink:to="loc_ipcc_CatastropheReinsuranceAdditionalCoverageThirdPartyRecoveryPercentage_8C9B5A7065814EE5831E155A9CED3DAA" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_CatastropheReinsuranceMaximumThirdPartyRecovery" xlink:label="loc_ipcc_CatastropheReinsuranceMaximumThirdPartyRecovery_2A5B71EB66AEB2CA3D79155A9CED00BE" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems_3A7325C8D213E0E5B998155A9CED95FD" xlink:to="loc_ipcc_CatastropheReinsuranceMaximumThirdPartyRecovery_2A5B71EB66AEB2CA3D79155A9CED00BE" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_CatastropheReinsuranceMinimumLossThresholdPerEvent" xlink:label="loc_ipcc_CatastropheReinsuranceMinimumLossThresholdPerEvent_B0A835252D35491AB72C155A9CED3546" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems_3A7325C8D213E0E5B998155A9CED95FD" xlink:to="loc_ipcc_CatastropheReinsuranceMinimumLossThresholdPerEvent_B0A835252D35491AB72C155A9CED3546" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_CatastropheReinsuranceAdditionalCoverageLossCoverageBasePerEvent" xlink:label="loc_ipcc_CatastropheReinsuranceAdditionalCoverageLossCoverageBasePerEvent_9C528DE1851B6C0364B4155A9CED5C19" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems_3A7325C8D213E0E5B998155A9CED95FD" xlink:to="loc_ipcc_CatastropheReinsuranceAdditionalCoverageLossCoverageBasePerEvent_9C528DE1851B6C0364B4155A9CED5C19" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_CatastropheReinsuranceAdditionalCoverageMinimumLossThresholdPerEvent" xlink:label="loc_ipcc_CatastropheReinsuranceAdditionalCoverageMinimumLossThresholdPerEvent_B66EBD095BA2C1C891E0155A9CED1723" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems_3A7325C8D213E0E5B998155A9CED95FD" xlink:to="loc_ipcc_CatastropheReinsuranceAdditionalCoverageMinimumLossThresholdPerEvent_B66EBD095BA2C1C891E0155A9CED1723" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_PropertyCatastropheReinsuranceFirstLayer" xlink:label="loc_ipcc_PropertyCatastropheReinsuranceFirstLayer_2AC58D5374A572D149E4155A9CED2EA6" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems_3A7325C8D213E0E5B998155A9CED95FD" xlink:to="loc_ipcc_PropertyCatastropheReinsuranceFirstLayer_2AC58D5374A572D149E4155A9CED2EA6" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_PropertyCatastropheReinsuranceFirstLayerPercentage" xlink:label="loc_ipcc_PropertyCatastropheReinsuranceFirstLayerPercentage_F34B89BE15C3DDA46549155A9CED89D6" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems_3A7325C8D213E0E5B998155A9CED95FD" xlink:to="loc_ipcc_PropertyCatastropheReinsuranceFirstLayerPercentage_F34B89BE15C3DDA46549155A9CED89D6" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_PropertyCatastropheReinsuranceRemainingLayersPercentage" xlink:label="loc_ipcc_PropertyCatastropheReinsuranceRemainingLayersPercentage_128A476222B47998DCFB155A9CED5D96" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems_3A7325C8D213E0E5B998155A9CED95FD" xlink:to="loc_ipcc_PropertyCatastropheReinsuranceRemainingLayersPercentage_128A476222B47998DCFB155A9CED5D96" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded" xlink:label="loc_us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded_49D2CB8E11F9D42D4D12155A9CED01FF" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems_3A7325C8D213E0E5B998155A9CED95FD" xlink:to="loc_us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded_49D2CB8E11F9D42D4D12155A9CED01FF" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/ReinsuranceTableDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/ReinsuranceTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/ShareBasedCompensation" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/ShareBasedCompensationCompensationCostDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_BA08299F5E91CC80BAD6F4F33F64ADCC" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_656CBA2CEF6D8028847DF4F33F5D988E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_BA08299F5E91CC80BAD6F4F33F64ADCC" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_656CBA2CEF6D8028847DF4F33F5D988E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_5EFCE3A75D34B4E070C4F4F33F63AAD6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_656CBA2CEF6D8028847DF4F33F5D988E" xlink:to="loc_us-gaap_PlanNameAxis_5EFCE3A75D34B4E070C4F4F33F63AAD6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_3081C177F9403B69766EF4F33F63D181_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_5EFCE3A75D34B4E070C4F4F33F63AAD6" xlink:to="loc_us-gaap_PlanNameDomain_3081C177F9403B69766EF4F33F63D181_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_3081C177F9403B69766EF4F33F63D181" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_5EFCE3A75D34B4E070C4F4F33F63AAD6" xlink:to="loc_us-gaap_PlanNameDomain_3081C177F9403B69766EF4F33F63D181" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_RestrictedStockPlanMember" xlink:label="loc_ipcc_RestrictedStockPlanMember_6DB01715C04679F7C3FDF4F33F6386FD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_3081C177F9403B69766EF4F33F63D181" xlink:to="loc_ipcc_RestrictedStockPlanMember_6DB01715C04679F7C3FDF4F33F6386FD" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_DirectorsPlanMember" xlink:label="loc_ipcc_DirectorsPlanMember_E5356447DB56F8817A6AF4F33F630BB7" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_3081C177F9403B69766EF4F33F63D181" xlink:to="loc_ipcc_DirectorsPlanMember_E5356447DB56F8817A6AF4F33F630BB7" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_EmployeeStockPurchasePlanEsppMember" xlink:label="loc_ipcc_EmployeeStockPurchasePlanEsppMember_3A651CA8CC37C2A29FF1F4F33F635EF7" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_3081C177F9403B69766EF4F33F63D181" xlink:to="loc_ipcc_EmployeeStockPurchasePlanEsppMember_3A651CA8CC37C2A29FF1F4F33F635EF7" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_PerformanceSharePlanPspMember" xlink:label="loc_ipcc_PerformanceSharePlanPspMember_9997022A07EA36256855F4F33F63A2D8" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_3081C177F9403B69766EF4F33F63D181" xlink:to="loc_ipcc_PerformanceSharePlanPspMember_9997022A07EA36256855F4F33F63A2D8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_43CB19AAC343A9BFDF62F4F33F64D93D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_BA08299F5E91CC80BAD6F4F33F64ADCC" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_43CB19AAC343A9BFDF62F4F33F64D93D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_DE3CE15719BA035CABEEF4F33F64D905" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_BA08299F5E91CC80BAD6F4F33F64ADCC" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_DE3CE15719BA035CABEEF4F33F64D905" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/ShareBasedCompensationEmployeeStockPurchasePlanDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_409A0269EAE86F5682D63C9A60BBCE22" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_CF28ED00336F0FA574233C9A60BB0A20" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_409A0269EAE86F5682D63C9A60BBCE22" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_CF28ED00336F0FA574233C9A60BB0A20" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_257B8F0C2A63038662073C9A60BB1C76" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_CF28ED00336F0FA574233C9A60BB0A20" xlink:to="loc_us-gaap_PlanNameAxis_257B8F0C2A63038662073C9A60BB1C76" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_9E2FA61B9EEEDC7ADE873C9A60BBD263_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_257B8F0C2A63038662073C9A60BB1C76" xlink:to="loc_us-gaap_PlanNameDomain_9E2FA61B9EEEDC7ADE873C9A60BBD263_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_9E2FA61B9EEEDC7ADE873C9A60BBD263" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_257B8F0C2A63038662073C9A60BB1C76" xlink:to="loc_us-gaap_PlanNameDomain_9E2FA61B9EEEDC7ADE873C9A60BBD263" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_EmployeeStockPurchasePlanEsppMember" xlink:label="loc_ipcc_EmployeeStockPurchasePlanEsppMember_391AC276477613ED2EBB3C9A60BB6636" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_9E2FA61B9EEEDC7ADE873C9A60BBD263" xlink:to="loc_ipcc_EmployeeStockPurchasePlanEsppMember_391AC276477613ED2EBB3C9A60BB6636" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_8D8F62D6C83669D830C03C9A60BB027F" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_CF28ED00336F0FA574233C9A60BB0A20" xlink:to="loc_us-gaap_AwardTypeAxis_8D8F62D6C83669D830C03C9A60BB027F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4C68E5FA591086757E3A3C9A60BBC9E6_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_8D8F62D6C83669D830C03C9A60BB027F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4C68E5FA591086757E3A3C9A60BBC9E6_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4C68E5FA591086757E3A3C9A60BBC9E6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_8D8F62D6C83669D830C03C9A60BB027F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4C68E5FA591086757E3A3C9A60BBC9E6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_EEB08DD56315D9F912183C9A60BB63EB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4C68E5FA591086757E3A3C9A60BBC9E6" xlink:to="loc_us-gaap_CommonStockMember_EEB08DD56315D9F912183C9A60BB63EB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate_3C2668B1685AEFCB25103C9A60BBCB98" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_409A0269EAE86F5682D63C9A60BBCE22" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate_3C2668B1685AEFCB25103C9A60BBCB98" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate_6C3996A92D88F96F5FBF3C9A60BB8C79" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_409A0269EAE86F5682D63C9A60BBCE22" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate_6C3996A92D88F96F5FBF3C9A60BB8C79" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAnnualPurchaseAmountPerEmployee" xlink:label="loc_ipcc_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAnnualPurchaseAmountPerEmployee_A51C6E8CA5A3BA59FC103C9A60BB16F2" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_409A0269EAE86F5682D63C9A60BBCE22" xlink:to="loc_ipcc_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAnnualPurchaseAmountPerEmployee_A51C6E8CA5A3BA59FC103C9A60BB16F2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_5B06E70E84FEC8C16B883C9A60BBDDB5" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_409A0269EAE86F5682D63C9A60BBCE22" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_5B06E70E84FEC8C16B883C9A60BBDDB5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_68E92B425C250392A37A3C9A60BB0DD2" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_409A0269EAE86F5682D63C9A60BBCE22" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_68E92B425C250392A37A3C9A60BB0DD2" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/ShareBasedCompensationFairValueAssumptionsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_D7F3006C2673027FA446F4F56CE97D6A" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_5D844FFB44510F623458F4F56CE9CA0E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_D7F3006C2673027FA446F4F56CE97D6A" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_5D844FFB44510F623458F4F56CE9CA0E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_5FCDC1B12ADB30E9DB89F4F56CE9A4F0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_5D844FFB44510F623458F4F56CE9CA0E" xlink:to="loc_us-gaap_PlanNameAxis_5FCDC1B12ADB30E9DB89F4F56CE9A4F0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_509DBAA0B3E7F5F9BDE6F4F56CE9A0E3_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_5FCDC1B12ADB30E9DB89F4F56CE9A4F0" xlink:to="loc_us-gaap_PlanNameDomain_509DBAA0B3E7F5F9BDE6F4F56CE9A0E3_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_509DBAA0B3E7F5F9BDE6F4F56CE9A0E3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_5FCDC1B12ADB30E9DB89F4F56CE9A4F0" xlink:to="loc_us-gaap_PlanNameDomain_509DBAA0B3E7F5F9BDE6F4F56CE9A0E3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_7D851FA6BB432603517DF4F56CE9FD95" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_5D844FFB44510F623458F4F56CE9CA0E" xlink:to="loc_us-gaap_AwardTypeAxis_7D851FA6BB432603517DF4F56CE9FD95" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_CEB74504BA1F85C47DF4F4F56CE9FB9C_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_7D851FA6BB432603517DF4F56CE9FD95" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_CEB74504BA1F85C47DF4F4F56CE9FB9C_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_CEB74504BA1F85C47DF4F4F56CE9FB9C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_7D851FA6BB432603517DF4F56CE9FD95" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_CEB74504BA1F85C47DF4F4F56CE9FB9C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_D94894C646AA430DFEA4F4F56CE9535C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_CEB74504BA1F85C47DF4F4F56CE9FB9C" xlink:to="loc_us-gaap_EmployeeStockOptionMember_D94894C646AA430DFEA4F4F56CE9535C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_F63E7ED340E22333C90DF4F56CE9A2C3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_D7F3006C2673027FA446F4F56CE97D6A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_F63E7ED340E22333C90DF4F56CE9A2C3" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/ShareBasedCompensationPlansDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9AA967430C42E1A941DCF4EC0A1301D0" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_DAEAAEC454323C140ADAF4EC0A1308B4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9AA967430C42E1A941DCF4EC0A1301D0" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_DAEAAEC454323C140ADAF4EC0A1308B4" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_DB4EB894660012177B93F4EC0A130F25" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_DAEAAEC454323C140ADAF4EC0A1308B4" xlink:to="loc_us-gaap_PlanNameAxis_DB4EB894660012177B93F4EC0A130F25" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_52652642AFA3D1CCE31EF4EC0A13FB36_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_DB4EB894660012177B93F4EC0A130F25" xlink:to="loc_us-gaap_PlanNameDomain_52652642AFA3D1CCE31EF4EC0A13FB36_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_52652642AFA3D1CCE31EF4EC0A13FB36" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_DB4EB894660012177B93F4EC0A130F25" xlink:to="loc_us-gaap_PlanNameDomain_52652642AFA3D1CCE31EF4EC0A13FB36" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_A2013PlanMember" xlink:label="loc_ipcc_A2013PlanMember_FD43ADE1EA8F642A494DF4EC0A1310DA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_52652642AFA3D1CCE31EF4EC0A13FB36" xlink:to="loc_ipcc_A2013PlanMember_FD43ADE1EA8F642A494DF4EC0A1310DA" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_RestrictedStockPlanMember" xlink:label="loc_ipcc_RestrictedStockPlanMember_C3EF2364142308DA5F2CF4EC0A1341A0" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_52652642AFA3D1CCE31EF4EC0A13FB36" xlink:to="loc_ipcc_RestrictedStockPlanMember_C3EF2364142308DA5F2CF4EC0A1341A0" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_DirectorsPlanMember" xlink:label="loc_ipcc_DirectorsPlanMember_DDB2F12865E88587A585F4EC0A136C82" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_52652642AFA3D1CCE31EF4EC0A13FB36" xlink:to="loc_ipcc_DirectorsPlanMember_DDB2F12865E88587A585F4EC0A136C82" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_EmployeeStockPurchasePlanEsppMember" xlink:label="loc_ipcc_EmployeeStockPurchasePlanEsppMember_2018C75AFAE5A7D4BA0FF4EC0A1339B0" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_52652642AFA3D1CCE31EF4EC0A13FB36" xlink:to="loc_ipcc_EmployeeStockPurchasePlanEsppMember_2018C75AFAE5A7D4BA0FF4EC0A1339B0" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_PerformanceSharePlanPspMember" xlink:label="loc_ipcc_PerformanceSharePlanPspMember_53FDA98814B48BD08406F4EC0A13E586" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_52652642AFA3D1CCE31EF4EC0A13FB36" xlink:to="loc_ipcc_PerformanceSharePlanPspMember_53FDA98814B48BD08406F4EC0A13E586" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_599B18F472AA3061A1FDF4EC0A138BD1" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_DAEAAEC454323C140ADAF4EC0A1308B4" xlink:to="loc_us-gaap_AwardTypeAxis_599B18F472AA3061A1FDF4EC0A138BD1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_545A76588BFA9CE4F085F4EC0A13AB3F_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_599B18F472AA3061A1FDF4EC0A138BD1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_545A76588BFA9CE4F085F4EC0A13AB3F_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_545A76588BFA9CE4F085F4EC0A13AB3F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_599B18F472AA3061A1FDF4EC0A138BD1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_545A76588BFA9CE4F085F4EC0A13AB3F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_945BC874267D8679F7E5F4EC0A133ED3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_545A76588BFA9CE4F085F4EC0A13AB3F" xlink:to="loc_us-gaap_RestrictedStockMember_945BC874267D8679F7E5F4EC0A133ED3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_8492BAD4DB2A9A1E3214F4EC0A13501E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_545A76588BFA9CE4F085F4EC0A13AB3F" xlink:to="loc_us-gaap_CommonStockMember_8492BAD4DB2A9A1E3214F4EC0A13501E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_03159333B1B2BF62F2D2F4EC0A134F7E" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_545A76588BFA9CE4F085F4EC0A13AB3F" xlink:to="loc_us-gaap_EmployeeStockOptionMember_03159333B1B2BF62F2D2F4EC0A134F7E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TitleOfIndividualAxis" xlink:label="loc_us-gaap_TitleOfIndividualAxis_D35495D10DC4C4D60218F4EC0A138E02" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_DAEAAEC454323C140ADAF4EC0A1308B4" xlink:to="loc_us-gaap_TitleOfIndividualAxis_D35495D10DC4C4D60218F4EC0A138E02" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_1DA93C320F0524F83D60F4EC0A13C798_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TitleOfIndividualAxis_D35495D10DC4C4D60218F4EC0A138E02" xlink:to="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_1DA93C320F0524F83D60F4EC0A13C798_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_1DA93C320F0524F83D60F4EC0A13C798" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TitleOfIndividualAxis_D35495D10DC4C4D60218F4EC0A138E02" xlink:to="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_1DA93C320F0524F83D60F4EC0A13C798" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OfficerMember" xlink:label="loc_us-gaap_OfficerMember_9FCB1402391CF89026FCF4EC0A13CBBD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_1DA93C320F0524F83D60F4EC0A13C798" xlink:to="loc_us-gaap_OfficerMember_9FCB1402391CF89026FCF4EC0A13CBBD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_FD441FF0AF62EBAF7431F4EC0A1349E6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9AA967430C42E1A941DCF4EC0A1301D0" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_FD441FF0AF62EBAF7431F4EC0A1349E6" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/ShareBasedCompensationShareAwardsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_E5CBF63E9A3FA8A297430A343BCBB02A" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_96D0134DBB6C9F16103E0A343BC19D09" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_E5CBF63E9A3FA8A297430A343BCBB02A" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_96D0134DBB6C9F16103E0A343BC19D09" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TitleOfIndividualAxis" xlink:label="loc_us-gaap_TitleOfIndividualAxis_DE0593479A13BDEA9B200A343BC1EB63" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_96D0134DBB6C9F16103E0A343BC19D09" xlink:to="loc_us-gaap_TitleOfIndividualAxis_DE0593479A13BDEA9B200A343BC1EB63" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_AC1977CFB22CCA8188030A343BC18D7E_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TitleOfIndividualAxis_DE0593479A13BDEA9B200A343BC1EB63" xlink:to="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_AC1977CFB22CCA8188030A343BC18D7E_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_AC1977CFB22CCA8188030A343BC18D7E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TitleOfIndividualAxis_DE0593479A13BDEA9B200A343BC1EB63" xlink:to="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_AC1977CFB22CCA8188030A343BC18D7E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OfficerMember" xlink:label="loc_us-gaap_OfficerMember_63E90078DB37F7478A620A343BC11C51" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_AC1977CFB22CCA8188030A343BC18D7E" xlink:to="loc_us-gaap_OfficerMember_63E90078DB37F7478A620A343BC11C51" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_3B14961E6B43DE60F77C0A343BC12250" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_96D0134DBB6C9F16103E0A343BC19D09" xlink:to="loc_us-gaap_PlanNameAxis_3B14961E6B43DE60F77C0A343BC12250" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_2448EB72C417F2CDAF960A343BC135B3_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_3B14961E6B43DE60F77C0A343BC12250" xlink:to="loc_us-gaap_PlanNameDomain_2448EB72C417F2CDAF960A343BC135B3_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_2448EB72C417F2CDAF960A343BC135B3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_3B14961E6B43DE60F77C0A343BC12250" xlink:to="loc_us-gaap_PlanNameDomain_2448EB72C417F2CDAF960A343BC135B3" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_A2013PlanMember" xlink:label="loc_ipcc_A2013PlanMember_C40031D0998BDFEA81270A343BC12D20" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_2448EB72C417F2CDAF960A343BC135B3" xlink:to="loc_ipcc_A2013PlanMember_C40031D0998BDFEA81270A343BC12D20" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_PriorPlanMember" xlink:label="loc_ipcc_PriorPlanMember_6C2CF637230C9B4951160A343BCBF987" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_2448EB72C417F2CDAF960A343BC135B3" xlink:to="loc_ipcc_PriorPlanMember_6C2CF637230C9B4951160A343BCBF987" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_632F112635A1A5D1B2030A343BCB736B" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_96D0134DBB6C9F16103E0A343BC19D09" xlink:to="loc_us-gaap_AwardTypeAxis_632F112635A1A5D1B2030A343BCB736B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_535549ED7552E0FDC70A0A343BCB2743_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_632F112635A1A5D1B2030A343BCB736B" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_535549ED7552E0FDC70A0A343BCB2743_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_535549ED7552E0FDC70A0A343BCB2743" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_632F112635A1A5D1B2030A343BCB736B" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_535549ED7552E0FDC70A0A343BCB2743" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_3A66E97AA8BB6E60F3590A343BCB73F0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_535549ED7552E0FDC70A0A343BCB2743" xlink:to="loc_us-gaap_RestrictedStockMember_3A66E97AA8BB6E60F3590A343BCB73F0" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_NonemployeeDirectorsStockMember" xlink:label="loc_ipcc_NonemployeeDirectorsStockMember_E1202D3270D9F23DDF970A343BCB6EC5" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_535549ED7552E0FDC70A0A343BCB2743" xlink:to="loc_ipcc_NonemployeeDirectorsStockMember_E1202D3270D9F23DDF970A343BCB6EC5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PerformanceSharesMember" xlink:label="loc_us-gaap_PerformanceSharesMember_4CB2A3F2907E41FD9A890A343BCB0F09" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_535549ED7552E0FDC70A0A343BCB2743" xlink:to="loc_us-gaap_PerformanceSharesMember_4CB2A3F2907E41FD9A890A343BCB0F09" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_B89D888982B93045E25F0A438EE4D76F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_E5CBF63E9A3FA8A297430A343BCBB02A" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_B89D888982B93045E25F0A438EE4D76F" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/ShareBasedCompensationShareBasedCompensationRestrictedStockActivityDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3C835C8AEE604C0B71DF0A343B8F3E41" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4E835E9320C4E35AB9F70A343B854716" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3C835C8AEE604C0B71DF0A343B8F3E41" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4E835E9320C4E35AB9F70A343B854716" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_28D776042D5027DDCDB60A6300A8B46B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4E835E9320C4E35AB9F70A343B854716" xlink:to="loc_us-gaap_StatementScenarioAxis_28D776042D5027DDCDB60A6300A8B46B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_F2B8E80524ED3947397C0A6300BCA4C0_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_28D776042D5027DDCDB60A6300A8B46B" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_F2B8E80524ED3947397C0A6300BCA4C0_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_F2B8E80524ED3947397C0A6300BCA4C0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_28D776042D5027DDCDB60A6300A8B46B" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_F2B8E80524ED3947397C0A6300BCA4C0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioForecastMember" xlink:label="loc_us-gaap_ScenarioForecastMember_2E4E3A27027A06B7EB1F0A632708F7D5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScenarioUnspecifiedDomain_F2B8E80524ED3947397C0A6300BCA4C0" xlink:to="loc_us-gaap_ScenarioForecastMember_2E4E3A27027A06B7EB1F0A632708F7D5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TitleOfIndividualAxis" xlink:label="loc_us-gaap_TitleOfIndividualAxis_057C242D98A4BACE014C0A343B850D47" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4E835E9320C4E35AB9F70A343B854716" xlink:to="loc_us-gaap_TitleOfIndividualAxis_057C242D98A4BACE014C0A343B850D47" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_D75B003CC30B1D1D56BE0A343B859C2F_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TitleOfIndividualAxis_057C242D98A4BACE014C0A343B850D47" xlink:to="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_D75B003CC30B1D1D56BE0A343B859C2F_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_D75B003CC30B1D1D56BE0A343B859C2F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TitleOfIndividualAxis_057C242D98A4BACE014C0A343B850D47" xlink:to="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_D75B003CC30B1D1D56BE0A343B859C2F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OfficerMember" xlink:label="loc_us-gaap_OfficerMember_BF17BCE95ECD0D2B482E0A343B85B197" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_D75B003CC30B1D1D56BE0A343B859C2F" xlink:to="loc_us-gaap_OfficerMember_BF17BCE95ECD0D2B482E0A343B85B197" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_6797D3451D5883059F0F0A343B856185" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4E835E9320C4E35AB9F70A343B854716" xlink:to="loc_us-gaap_PlanNameAxis_6797D3451D5883059F0F0A343B856185" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_F302671B871A730DA0D90A343B85523D_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_6797D3451D5883059F0F0A343B856185" xlink:to="loc_us-gaap_PlanNameDomain_F302671B871A730DA0D90A343B85523D_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_F302671B871A730DA0D90A343B85523D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_6797D3451D5883059F0F0A343B856185" xlink:to="loc_us-gaap_PlanNameDomain_F302671B871A730DA0D90A343B85523D" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_RestrictedStockPlanMember" xlink:label="loc_ipcc_RestrictedStockPlanMember_2319A9BD52E19A3F97620A343B853695" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_F302671B871A730DA0D90A343B85523D" xlink:to="loc_ipcc_RestrictedStockPlanMember_2319A9BD52E19A3F97620A343B853695" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_A2013PlanMember" xlink:label="loc_ipcc_A2013PlanMember_9ECC904DAEEFB7B189E10A343B857C8B" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_F302671B871A730DA0D90A343B85523D" xlink:to="loc_ipcc_A2013PlanMember_9ECC904DAEEFB7B189E10A343B857C8B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_592FB79FBCB01CD2C46E0A343B8F2AD3" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4E835E9320C4E35AB9F70A343B854716" xlink:to="loc_us-gaap_AwardTypeAxis_592FB79FBCB01CD2C46E0A343B8F2AD3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C0D98EF74BF882F7C9390A343B8FA9E3_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_592FB79FBCB01CD2C46E0A343B8F2AD3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C0D98EF74BF882F7C9390A343B8FA9E3_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C0D98EF74BF882F7C9390A343B8FA9E3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_592FB79FBCB01CD2C46E0A343B8F2AD3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C0D98EF74BF882F7C9390A343B8FA9E3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_B46C5D1517154B956B770A343B8FC500" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C0D98EF74BF882F7C9390A343B8FA9E3" xlink:to="loc_us-gaap_RestrictedStockMember_B46C5D1517154B956B770A343B8FC500" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_96F80AF3146F9D197FAE0A343B8FEAA9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3C835C8AEE604C0B71DF0A343B8F3E41" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_96F80AF3146F9D197FAE0A343B8FEAA9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_59C5993A1FF9F76F3D890A62383734A6" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3C835C8AEE604C0B71DF0A343B8F3E41" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_59C5993A1FF9F76F3D890A62383734A6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_608F88C1716732317A4D0A343B8F470C" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3C835C8AEE604C0B71DF0A343B8F3E41" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_608F88C1716732317A4D0A343B8F470C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_84162CF2B0462421F5620A343B8FC9AA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_608F88C1716732317A4D0A343B8F470C" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_84162CF2B0462421F5620A343B8FC9AA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_5B1D1E335FDA74C4565D0A343B8F5B73" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_608F88C1716732317A4D0A343B8F470C" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_5B1D1E335FDA74C4565D0A343B8F5B73" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_F753398C606F66B6A2260A343B8FBC27" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3C835C8AEE604C0B71DF0A343B8F3E41" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_F753398C606F66B6A2260A343B8FBC27" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_DAA90B67CF36FC0B6E150A343B8F8643" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_F753398C606F66B6A2260A343B8FBC27" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_DAA90B67CF36FC0B6E150A343B8F8643" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_C954A3843500B2CC52DD0A343B8F9F50" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_F753398C606F66B6A2260A343B8FBC27" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_C954A3843500B2CC52DD0A343B8F9F50" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_E5ACA26E889590780CC90A343B8F7BFD" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_F753398C606F66B6A2260A343B8FBC27" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_E5ACA26E889590780CC90A343B8F7BFD" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/ShareBasedCompensationStockOptionActivityDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5987814A05ACEA557729F4F36EBE2115" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_95399E4425E9AE4C3B74F4F36EBE4B02" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5987814A05ACEA557729F4F36EBE2115" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_95399E4425E9AE4C3B74F4F36EBE4B02" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_9D7BA695D3320A9EB2A2F4F36EBE7A1C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_95399E4425E9AE4C3B74F4F36EBE4B02" xlink:to="loc_us-gaap_PlanNameAxis_9D7BA695D3320A9EB2A2F4F36EBE7A1C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_8AD07F9EB2258607A563F4F36EBE045A_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_9D7BA695D3320A9EB2A2F4F36EBE7A1C" xlink:to="loc_us-gaap_PlanNameDomain_8AD07F9EB2258607A563F4F36EBE045A_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_8AD07F9EB2258607A563F4F36EBE045A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_9D7BA695D3320A9EB2A2F4F36EBE7A1C" xlink:to="loc_us-gaap_PlanNameDomain_8AD07F9EB2258607A563F4F36EBE045A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_06FC8470A58432A6B4CCF4F36EBEC7A6" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_95399E4425E9AE4C3B74F4F36EBE4B02" xlink:to="loc_us-gaap_AwardTypeAxis_06FC8470A58432A6B4CCF4F36EBEC7A6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_A4AC5ADE38A6867C7EA0F4F36EBECB5D_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_06FC8470A58432A6B4CCF4F36EBEC7A6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_A4AC5ADE38A6867C7EA0F4F36EBECB5D_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_A4AC5ADE38A6867C7EA0F4F36EBECB5D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_06FC8470A58432A6B4CCF4F36EBEC7A6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_A4AC5ADE38A6867C7EA0F4F36EBECB5D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_0F7536CA7F1112F46CDAF4F36EBEC0CA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_A4AC5ADE38A6867C7EA0F4F36EBECB5D" xlink:to="loc_us-gaap_EmployeeStockOptionMember_0F7536CA7F1112F46CDAF4F36EBEC0CA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_6B7A39C000DDA6643E8FF4F36EBE587B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5987814A05ACEA557729F4F36EBE2115" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_6B7A39C000DDA6643E8FF4F36EBE587B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_FAD3DCF4F42A51875E6BF4F36EBE2C67" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_6B7A39C000DDA6643E8FF4F36EBE587B" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_FAD3DCF4F42A51875E6BF4F36EBE2C67" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_61F98C42797215DD1D80F4F36ECEB04C" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5987814A05ACEA557729F4F36EBE2115" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_61F98C42797215DD1D80F4F36ECEB04C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_91AD84689FFB8F341681F4F36ECEC4AD" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5987814A05ACEA557729F4F36EBE2115" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_91AD84689FFB8F341681F4F36ECEC4AD" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/ShareBasedCompensationTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/SignificantReportingAndAccountingPolicies" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/SignificantReportingAndAccountingPoliciesDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConcentrationRiskLineItems" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_C5732C191A53BCEEF74D0B896996CFF3" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConcentrationRiskTable" xlink:label="loc_us-gaap_ConcentrationRiskTable_57EDCE37C2DCE5CCB7470B89699486BA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_C5732C191A53BCEEF74D0B896996CFF3" xlink:to="loc_us-gaap_ConcentrationRiskTable_57EDCE37C2DCE5CCB7470B89699486BA" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProductOrServiceAxis" xlink:label="loc_us-gaap_ProductOrServiceAxis_C10DA0759EB5C875C0740B8969945664" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_57EDCE37C2DCE5CCB7470B89699486BA" xlink:to="loc_us-gaap_ProductOrServiceAxis_C10DA0759EB5C875C0740B8969945664" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProductsAndServicesDomain" xlink:label="loc_us-gaap_ProductsAndServicesDomain_412108D8BC51C0DA02AA0B896995CFB3_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ProductOrServiceAxis_C10DA0759EB5C875C0740B8969945664" xlink:to="loc_us-gaap_ProductsAndServicesDomain_412108D8BC51C0DA02AA0B896995CFB3_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProductsAndServicesDomain" xlink:label="loc_us-gaap_ProductsAndServicesDomain_412108D8BC51C0DA02AA0B896995CFB3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ProductOrServiceAxis_C10DA0759EB5C875C0740B8969945664" xlink:to="loc_us-gaap_ProductsAndServicesDomain_412108D8BC51C0DA02AA0B896995CFB3" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_PersonalAutoInsuranceMember" xlink:label="loc_ipcc_PersonalAutoInsuranceMember_7D32CEFFF5FE5306DB9F0B89699503EE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductsAndServicesDomain_412108D8BC51C0DA02AA0B896995CFB3" xlink:to="loc_ipcc_PersonalAutoInsuranceMember_7D32CEFFF5FE5306DB9F0B89699503EE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_E43650E9BF3F85890C170B8969954CEC" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_57EDCE37C2DCE5CCB7470B89699486BA" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_E43650E9BF3F85890C170B8969954CEC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_80B8B645BDEE07721FE30B8969957E75_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_E43650E9BF3F85890C170B8969954CEC" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_80B8B645BDEE07721FE30B8969957E75_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_80B8B645BDEE07721FE30B8969957E75" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_E43650E9BF3F85890C170B8969954CEC" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_80B8B645BDEE07721FE30B8969957E75" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SalesRevenueProductLineMember" xlink:label="loc_us-gaap_SalesRevenueProductLineMember_904CABFD7AF6D2B17ADE0B896995CA81" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_80B8B645BDEE07721FE30B8969957E75" xlink:to="loc_us-gaap_SalesRevenueProductLineMember_904CABFD7AF6D2B17ADE0B896995CA81" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConcentrationRiskByTypeAxis" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_3EDBA0282D8F71B9B6A90B89699574D0" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_57EDCE37C2DCE5CCB7470B89699486BA" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_3EDBA0282D8F71B9B6A90B89699574D0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_96EC73C806707F353DBC0B896995883D_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_3EDBA0282D8F71B9B6A90B89699574D0" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_96EC73C806707F353DBC0B896995883D_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_96EC73C806707F353DBC0B896995883D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_3EDBA0282D8F71B9B6A90B89699574D0" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_96EC73C806707F353DBC0B896995883D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProductConcentrationRiskMember" xlink:label="loc_us-gaap_ProductConcentrationRiskMember_70F5151D279748A9A5670B896996ACE9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_96EC73C806707F353DBC0B896995883D" xlink:to="loc_us-gaap_ProductConcentrationRiskMember_70F5151D279748A9A5670B896996ACE9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GeographicConcentrationRiskMember" xlink:label="loc_us-gaap_GeographicConcentrationRiskMember_6AB4B0FD17BE2A1F61A20B89699670E4" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_96EC73C806707F353DBC0B896995883D" xlink:to="loc_us-gaap_GeographicConcentrationRiskMember_6AB4B0FD17BE2A1F61A20B89699670E4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="loc_us-gaap_StatementGeographicalAxis_6FBEDFC99CE15AE29B3D0B8969967742" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_57EDCE37C2DCE5CCB7470B89699486BA" xlink:to="loc_us-gaap_StatementGeographicalAxis_6FBEDFC99CE15AE29B3D0B8969967742" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="loc_us-gaap_SegmentGeographicalDomain_12801E61CFDB712DA5BC0B8969969DC3_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementGeographicalAxis_6FBEDFC99CE15AE29B3D0B8969967742" xlink:to="loc_us-gaap_SegmentGeographicalDomain_12801E61CFDB712DA5BC0B8969969DC3_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="loc_us-gaap_SegmentGeographicalDomain_12801E61CFDB712DA5BC0B8969969DC3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementGeographicalAxis_6FBEDFC99CE15AE29B3D0B8969967742" xlink:to="loc_us-gaap_SegmentGeographicalDomain_12801E61CFDB712DA5BC0B8969969DC3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/stpr/2011/stpr-2011-01-31.xsd#stpr_CA" xlink:label="loc_stpr_CA_03EF20A21540F39CF5CE0B896996A01D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_12801E61CFDB712DA5BC0B8969969DC3" xlink:to="loc_stpr_CA_03EF20A21540F39CF5CE0B896996A01D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConcentrationRiskPercentage1" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_2B5563FB762CF037E4950B896996ACAC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_C5732C191A53BCEEF74D0B896996CFF3" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_2B5563FB762CF037E4950B896996ACAC" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_NumberOfStatesInWhichEntityPrimarilyOperates" xlink:label="loc_ipcc_NumberOfStatesInWhichEntityPrimarilyOperates_F894B3CE9D7F6BC1CEA30B8969969E9B" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_C5732C191A53BCEEF74D0B896996CFF3" xlink:to="loc_ipcc_NumberOfStatesInWhichEntityPrimarilyOperates_F894B3CE9D7F6BC1CEA30B8969969E9B" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/SignificantReportingAndAccountingPoliciesPolicies" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/SignificantReportingAndAccountingPoliciesSignificantReportingAndAccountingPoliciesDetails2" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_787CCEEF5AE7248228FE3C9A5DBF115F" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_EE19D64C83E3EC649D8B3C9A5DBFBD6D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_787CCEEF5AE7248228FE3C9A5DBF115F" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_EE19D64C83E3EC649D8B3C9A5DBFBD6D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_50C5B2CEB1F08FD5A85C3C9A5DBF5EC4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_EE19D64C83E3EC649D8B3C9A5DBFBD6D" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_50C5B2CEB1F08FD5A85C3C9A5DBF5EC4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_73E9B26DDCA518921C823C9A5DBF6D59_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_50C5B2CEB1F08FD5A85C3C9A5DBF5EC4" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_73E9B26DDCA518921C823C9A5DBF6D59_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_73E9B26DDCA518921C823C9A5DBF6D59" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_50C5B2CEB1F08FD5A85C3C9A5DBF5EC4" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_73E9B26DDCA518921C823C9A5DBF6D59" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LandBuildingsAndImprovementsMember" xlink:label="loc_us-gaap_LandBuildingsAndImprovementsMember_10450B8717FCE660C3CA3C9A5DBFEC1C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_73E9B26DDCA518921C823C9A5DBF6D59" xlink:to="loc_us-gaap_LandBuildingsAndImprovementsMember_10450B8717FCE660C3CA3C9A5DBFEC1C" xlink:type="arc" />
    <loc xlink:href="ipcc-20151231.xsd#ipcc_ComputerEquipmentandSoftwareMember" xlink:label="loc_ipcc_ComputerEquipmentandSoftwareMember_D08056AD30489CD631E63C9A5DBF482B" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_73E9B26DDCA518921C823C9A5DBF6D59" xlink:to="loc_ipcc_ComputerEquipmentandSoftwareMember_D08056AD30489CD631E63C9A5DBF482B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FurnitureAndFixturesMember" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_4870273E44A9A7D25B993C9A5DBFD32D" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_73E9B26DDCA518921C823C9A5DBF6D59" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_4870273E44A9A7D25B993C9A5DBFD32D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_B1E66EBDDB95067E9C553C9A5DBFD4E1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_787CCEEF5AE7248228FE3C9A5DBF115F" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_B1E66EBDDB95067E9C553C9A5DBFD4E1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_1B375B1CB823978DAB363C9A5DBFE7B3" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_787CCEEF5AE7248228FE3C9A5DBF115F" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_1B375B1CB823978DAB363C9A5DBFE7B3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_D6A9CB6F68931188D94B3C9A5DBFF443" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_787CCEEF5AE7248228FE3C9A5DBF115F" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_D6A9CB6F68931188D94B3C9A5DBFF443" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LeasesCapitalAbstract" xlink:label="loc_us-gaap_LeasesCapitalAbstract_D0F767E8C8E79866D70A3C9A5DBFFD99" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_787CCEEF5AE7248228FE3C9A5DBF115F" xlink:to="loc_us-gaap_LeasesCapitalAbstract_D0F767E8C8E79866D70A3C9A5DBFFD99" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet" xlink:label="loc_us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet_11BB710F97A0B6C370903C9A5DBF73CE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeasesCapitalAbstract_D0F767E8C8E79866D70A3C9A5DBFFD99" xlink:to="loc_us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet_11BB710F97A0B6C370903C9A5DBF73CE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation" xlink:label="loc_us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation_800D718CB5FB5338AC113C9A5DBF3BA2" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeasesCapitalAbstract_D0F767E8C8E79866D70A3C9A5DBFFD99" xlink:to="loc_us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation_800D718CB5FB5338AC113C9A5DBF3BA2" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/SignificantReportingAndAccountingPoliciesSignificantReportingAndAccountingPoliciesTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/StatutoryInformation" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/StatutoryInformationDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/StatutoryInformationTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.infinityauto.com/role/SubsequentEventsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventLineItems" xlink:label="loc_us-gaap_SubsequentEventLineItems_5A719339D6AF106A91B5F50165B2D9E0" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventTable" xlink:label="loc_us-gaap_SubsequentEventTable_620004FF1E92D00EF98AF50165B26931" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_5A719339D6AF106A91B5F50165B2D9E0" xlink:to="loc_us-gaap_SubsequentEventTable_620004FF1E92D00EF98AF50165B26931" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_1A550272441BAE13103CF50165B2F3C6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_620004FF1E92D00EF98AF50165B26931" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_1A550272441BAE13103CF50165B2F3C6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_B13F11040234B0B6B4C9F50165B2B6AF_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_1A550272441BAE13103CF50165B2F3C6" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_B13F11040234B0B6B4C9F50165B2B6AF_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_B13F11040234B0B6B4C9F50165B2B6AF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_1A550272441BAE13103CF50165B2F3C6" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_B13F11040234B0B6B4C9F50165B2B6AF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4755EE6CF66240C3C954F50165B258F8" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_620004FF1E92D00EF98AF50165B26931" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4755EE6CF66240C3C954F50165B258F8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_F143F17A478A437B50BAF50165B2F32B_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4755EE6CF66240C3C954F50165B258F8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_F143F17A478A437B50BAF50165B2F32B_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_F143F17A478A437B50BAF50165B2F32B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4755EE6CF66240C3C954F50165B258F8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_F143F17A478A437B50BAF50165B2F32B" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.infinityauto.com/role/SubsequentEventsNotes" xlink:type="extended" />
</linkbase>


