<?xml version="1.0" encoding="US-ASCII"?>
<!-- Generated by CompSci Transform (tm) - http://www.compsciresources.com -->
<!-- Created: Tue Jan 27 21:31:15 UTC 2026 -->
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:xbrldt="http://xbrl.org/2005/xbrldt">
  <roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/spac/2025q3/spac-2025q3.xsd#SecurityClassesOnly" roleURI="http://xbrl.sec.gov/spac/role/SecurityClassesOnly"/>
  <roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/spac/2025q3/spac-2025q3.xsd#DilutionSourcesOnly" roleURI="http://xbrl.sec.gov/spac/role/DilutionSourcesOnly"/>
  <roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/spac/2025q3/spac-2025q3.xsd#SponsorsAffiliatesOrPromotersOnly" roleURI="http://xbrl.sec.gov/spac/role/SponsorsAffiliateOrPromotersOnly"/>
  <roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/spac/2025q3/spac-2025q3.xsd#RedemptionLevelsOnly" roleURI="http://xbrl.sec.gov/spac/role/RedemptionLevelsOnly"/>
  <roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/spac/2025q3/spac-2025q3.xsd#CompensationNaturesOnly" roleURI="http://xbrl.sec.gov/spac/role/CompensationNaturesOnly"/>
  <roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/spac/2025q3/spac-2025q3.xsd#ConflictOfInterestPartiesOnly" roleURI="http://xbrl.sec.gov/spac/role/ConflictOfInterestPartiesOnly"/>
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default"/>
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain"/>
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension"/>
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member"/>
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" arcroleURI="http://xbrl.org/int/dim/arcrole/all"/>
  <definitionLink xlink:role="http://xbrl.sec.gov/spac/role/SecurityClassesOnly" xlink:type="extended">
    <loc xlink:type="locator" xlink:label="spac_AllSecurityClassesMember" xlink:href="https://xbrl.sec.gov/spac/2025q3/spac-2025q3.xsd#spac_AllSecurityClassesMember"/>
    <loc xlink:type="locator" xlink:label="wlac_PrivatePlacementUnitsMember" xlink:href="wlac-20260127.xsd#wlac_PrivatePlacementUnitsMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllSecurityClassesMember" xlink:to="wlac_PrivatePlacementUnitsMember" order="17" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="wlac_NetProceedsFromThisOfferingAndTheSaleOfPrivatePlacementUnitsMember" xlink:href="wlac-20260127.xsd#wlac_NetProceedsFromThisOfferingAndTheSaleOfPrivatePlacementUnitsMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllSecurityClassesMember" xlink:to="wlac_NetProceedsFromThisOfferingAndTheSaleOfPrivatePlacementUnitsMember" order="18" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="wlac_PlusOfferingCostsAccruedForOrPaidInAdvanceExcludedFromTangibleBookValueMember" xlink:href="wlac-20260127.xsd#wlac_PlusOfferingCostsAccruedForOrPaidInAdvanceExcludedFromTangibleBookValueMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllSecurityClassesMember" xlink:to="wlac_PlusOfferingCostsAccruedForOrPaidInAdvanceExcludedFromTangibleBookValueMember" order="19" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="wlac_LessOverallotmentLiabilityMember" xlink:href="wlac-20260127.xsd#wlac_LessOverallotmentLiabilityMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllSecurityClassesMember" xlink:to="wlac_LessOverallotmentLiabilityMember" order="20" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="wlac_LessDeferredUnderwritingCommissionMember" xlink:href="wlac-20260127.xsd#wlac_LessDeferredUnderwritingCommissionMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllSecurityClassesMember" xlink:to="wlac_LessDeferredUnderwritingCommissionMember" order="21" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="wlac_LessRedemptionsMember" xlink:href="wlac-20260127.xsd#wlac_LessRedemptionsMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllSecurityClassesMember" xlink:to="wlac_LessRedemptionsMember" order="22" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="wlac_OrdinarySharesOfferedMember" xlink:href="wlac-20260127.xsd#wlac_OrdinarySharesOfferedMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllSecurityClassesMember" xlink:to="wlac_OrdinarySharesOfferedMember" order="23" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="wlac_PrivatePlacementSharesMember" xlink:href="wlac-20260127.xsd#wlac_PrivatePlacementSharesMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllSecurityClassesMember" xlink:to="wlac_PrivatePlacementSharesMember" order="24" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="wlac_LessOrdinarySharesRedeemedMember" xlink:href="wlac-20260127.xsd#wlac_LessOrdinarySharesRedeemedMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllSecurityClassesMember" xlink:to="wlac_LessOrdinarySharesRedeemedMember" order="25" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:role="http://xbrl.sec.gov/spac/role/DilutionSourcesOnly" xlink:type="extended">
    <loc xlink:type="locator" xlink:label="spac_AllDilutionSourcesMember" xlink:href="https://xbrl.sec.gov/spac/2025q3/spac-2025q3.xsd#spac_AllDilutionSourcesMember"/>
    <loc xlink:type="locator" xlink:label="wlac_NoOverAllotmentMember" xlink:href="wlac-20260127.xsd#wlac_NoOverAllotmentMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllDilutionSourcesMember" xlink:to="wlac_NoOverAllotmentMember" order="23" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="wlac_FullOverAllotmentMember" xlink:href="wlac-20260127.xsd#wlac_FullOverAllotmentMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllDilutionSourcesMember" xlink:to="wlac_FullOverAllotmentMember" order="24" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="spac_RedemptionAt75PercentOfMaximumMember" xlink:href="https://xbrl.sec.gov/spac/2025q3/spac-2025q3.xsd#spac_RedemptionAt75PercentOfMaximumMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllDilutionSourcesMember" xlink:to="spac_RedemptionAt75PercentOfMaximumMember" order="25" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:role="http://xbrl.sec.gov/spac/role/SponsorsAffiliateOrPromotersOnly" xlink:type="extended">
    <loc xlink:type="locator" xlink:label="spac_AllSpacSponsorsAffiliatesOrPromotersMember" xlink:href="https://xbrl.sec.gov/spac/2025q3/spac-2025q3.xsd#spac_AllSpacSponsorsAffiliatesOrPromotersMember"/>
    <loc xlink:type="locator" xlink:label="wlac_WillowLaneSponsorIILLCMember" xlink:href="wlac-20260127.xsd#wlac_WillowLaneSponsorIILLCMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllSpacSponsorsAffiliatesOrPromotersMember" xlink:to="wlac_WillowLaneSponsorIILLCMember" order="13" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:role="http://xbrl.sec.gov/spac/role/RedemptionLevelsOnly" xlink:type="extended">
    <loc xlink:type="locator" xlink:label="spac_AllRedemptionLevelsMember" xlink:href="https://xbrl.sec.gov/spac/2025q3/spac-2025q3.xsd#spac_AllRedemptionLevelsMember"/>
    <loc xlink:type="locator" xlink:label="wlac_FullOverAllotmentMember" xlink:href="wlac-20260127.xsd#wlac_FullOverAllotmentMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllRedemptionLevelsMember" xlink:to="wlac_FullOverAllotmentMember" order="18" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:role="http://xbrl.sec.gov/spac/role/CompensationNaturesOnly" xlink:type="extended">
    <loc xlink:type="locator" xlink:label="spac_AllCompensationNaturesMember" xlink:href="https://xbrl.sec.gov/spac/2025q3/spac-2025q3.xsd#spac_AllCompensationNaturesMember"/>
    <loc xlink:type="locator" xlink:label="wlac_ClassBOrdinarySharesMember" xlink:href="wlac-20260127.xsd#wlac_ClassBOrdinarySharesMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllCompensationNaturesMember" xlink:to="wlac_ClassBOrdinarySharesMember" order="17" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="wlac_PrivatePlacementUnitsMember" xlink:href="wlac-20260127.xsd#wlac_PrivatePlacementUnitsMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllCompensationNaturesMember" xlink:to="wlac_PrivatePlacementUnitsMember" order="18" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OverAllotmentOptionMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OverAllotmentOptionMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllCompensationNaturesMember" xlink:to="us-gaap_OverAllotmentOptionMember" order="19" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="wlac_RepaymentOfLoansMember" xlink:href="wlac-20260127.xsd#wlac_RepaymentOfLoansMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllCompensationNaturesMember" xlink:to="wlac_RepaymentOfLoansMember" order="20" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="wlac_WorkingCapitalLoansMember" xlink:href="wlac-20260127.xsd#wlac_WorkingCapitalLoansMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllCompensationNaturesMember" xlink:to="wlac_WorkingCapitalLoansMember" order="21" xbrldt:closed="true"/>
  </definitionLink>
  <definitionLink xlink:role="http://xbrl.sec.gov/spac/role/ConflictOfInterestPartiesOnly" xlink:type="extended">
    <loc xlink:type="locator" xlink:label="spac_AllConflictOfInterestPartiesMember" xlink:href="https://xbrl.sec.gov/spac/2025q3/spac-2025q3.xsd#spac_AllConflictOfInterestPartiesMember"/>
    <loc xlink:type="locator" xlink:label="wlac_SponsorOfficersAndDirectorsLetterAgreementMember" xlink:href="wlac-20260127.xsd#wlac_SponsorOfficersAndDirectorsLetterAgreementMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllConflictOfInterestPartiesMember" xlink:to="wlac_SponsorOfficersAndDirectorsLetterAgreementMember" order="15" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="wlac_SponsorMember" xlink:href="wlac-20260127.xsd#wlac_SponsorMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllConflictOfInterestPartiesMember" xlink:to="wlac_SponsorMember" order="16" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="wlac_ConsultingAgreementsMember" xlink:href="wlac-20260127.xsd#wlac_ConsultingAgreementsMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllConflictOfInterestPartiesMember" xlink:to="wlac_ConsultingAgreementsMember" order="17" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="wlac_PersonnelMember" xlink:href="wlac-20260127.xsd#wlac_PersonnelMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllConflictOfInterestPartiesMember" xlink:to="wlac_PersonnelMember" order="18" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="wlac_SponsorOrMemberOfOurManagementTeamMember" xlink:href="wlac-20260127.xsd#wlac_SponsorOrMemberOfOurManagementTeamMember"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllConflictOfInterestPartiesMember" xlink:to="wlac_SponsorOrMemberOfOurManagementTeamMember" order="19" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="spac_SpacSponsorAndItsAffiliatesMember" xlink:href="https://xbrl.sec.gov/spac/2025q3/spac-2025q3.xsd#spac_SpacSponsorAndItsAffiliatesMember"/>
<!-- [WMV6][cVWXqJ7gEcZpW4LgS3DX319+M7BV3R00FULQSyBO1nj+UT5fOBQbpaEaSRW2+D/DPmlDGWtPlEjzQhY8xq4ucyka3Rq69rPtt9rbauE2eCnhC/WL2uiZQ+Bt1aPmlvcDgmqmiZyqkBWYiDOjGcM34IoIJV7pVIuxFYUA6X8tPpQC/KVqmZj0aYAQgL+CjYzycUIgMF0v5KgxArBHGsTX0okPjjLFBVS4ufi8ECcnBnd8qT1OCPpyeHecs+3Za3vEYdq3EoXNAuWWB42YygBuusHeFFLMZAbWBNJL1PLqkDlWs9/v67GmJ0bfvvNzbI37fcbZ3+wpe6hWFnrREUz1gEP3AFYmvwR+jFQGiTXM7zWSZMO3PVWA2Au3l8Id5iXpTN1DMUgh] CSR-->
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllConflictOfInterestPartiesMember" xlink:to="spac_SpacSponsorAndItsAffiliatesMember" order="20" xbrldt:closed="true"/>
  </definitionLink>
</linkbase>
