<?xml version="1.0" encoding="US-ASCII"?>  
<!-- Generated by CompSci Transform (tm) - http://www.compsciresources.com -->    
<!-- Created: Wed Nov 27 16:40:29 UTC 2024 -->  
<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/oef/2024/oef-2024.xsd#SeriesOnly" roleURI="http://xbrl.sec.gov/oef/role/SeriesOnly"/>     
  <roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2024/oef-2024.xsd#ClassOnly" roleURI="http://xbrl.sec.gov/oef/role/ClassOnly"/>   
  <roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2024/oef-2024.xsd#RiskOnly" roleURI="http://xbrl.sec.gov/rr/role/RiskOnly"/>     
  <roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2024/oef-2024.xsd#PerformanceMeasureOnly" roleURI="http://xbrl.sec.gov/rr/role/PerformanceMeasureOnly"/>   
  <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/oef/role/SeriesOnly" xlink:type="extended">    
    <loc xlink:type="locator" xlink:label="dei_EntityDomain" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityDomain"/> 
    <loc xlink:type="locator" xlink:label="ck0000880859_S000000226Member" xlink:href="ck0000880859-20241031.xsd#ck0000880859_S000000226Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000880859_S000000226Member" order="11" xbrldt:closed="true"/>   
  </definitionLink>     
  <definitionLink xlink:role="http://xbrl.sec.gov/oef/role/ClassOnly" xlink:type="extended">   
    <loc xlink:type="locator" xlink:label="oef_ShareClassDomain" xlink:href="https://xbrl.sec.gov/oef/2024/oef-2024.xsd#oef_ShareClassDomain"/>    
    <loc xlink:type="locator" xlink:label="ck0000880859_C000000537Member" xlink:href="ck0000880859-20241031.xsd#ck0000880859_C000000537Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000880859_C000000537Member" order="11" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000880859_C000000539Member" xlink:href="ck0000880859-20241031.xsd#ck0000880859_C000000539Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000880859_C000000539Member" order="12" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000880859_C000256073Member" xlink:href="ck0000880859-20241031.xsd#ck0000880859_C000256073Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000880859_C000256073Member" order="13" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000880859_C000071235Member" xlink:href="ck0000880859-20241031.xsd#ck0000880859_C000071235Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000880859_C000071235Member" order="14" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000880859_C000188848Member" xlink:href="ck0000880859-20241031.xsd#ck0000880859_C000188848Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000880859_C000188848Member" order="15" xbrldt:closed="true"/>  
  </definitionLink>     
  <definitionLink xlink:role="http://xbrl.sec.gov/rr/role/RiskOnly" xlink:type="extended"> 
<!-- [WMV6][XcpuxYn59dz7vgYynUDuwG7r97K2jUTysl7vcz0lJt+RMWF/8mwKgXndJJ1SJyvmgKvxuLfGxyYwOGgwR4iCxhnvainhLaXB34R7HXn8OgkWcEjbd9cL8fbUzOydS9+9GaKwuY9NrRwm80JdIgZBp+sMkgQNJIAKvnhsG37kvTIEu1Zfyj7mNwnhih02GV8cO4+wLaqX1zoqjVcCjfb+wo3EOLDXnKjjhJPW8CInPWa/+t4epI7YADX45qWRRXhHL8ZhFatUDy3kC/RJrFpxv4un2oN93QnEdezHq9qKs/8od4RPEoDfKg==] CSR-->   
    <loc xlink:type="locator" xlink:label="oef_AllRisksMember" xlink:href="https://xbrl.sec.gov/oef/2024/oef-2024.xsd#oef_AllRisksMember"/>     
    <loc xlink:type="locator" xlink:label="ck0000880859_MarketRiskMember" xlink:href="ck0000880859-20241031.xsd#ck0000880859_MarketRiskMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000880859_MarketRiskMember" order="11" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000880859_InvestingInStocksRiskMember" xlink:href="ck0000880859-20241031.xsd#ck0000880859_InvestingInStocksRiskMember"/>  
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000880859_InvestingInStocksRiskMember" order="12" xbrldt:closed="true"/> 
    <loc xlink:type="locator" xlink:label="ck0000880859_AsiaPacificRegionRiskexJapanMember" xlink:href="ck0000880859-20241031.xsd#ck0000880859_AsiaPacificRegionRiskexJapanMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000880859_AsiaPacificRegionRiskexJapanMember" order="13" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000880859_EmergingMarketSecuritiesRiskMember" xlink:href="ck0000880859-20241031.xsd#ck0000880859_EmergingMarketSecuritiesRiskMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000880859_EmergingMarketSecuritiesRiskMember" order="14" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000880859_ForeignSecuritiesRiskMember" xlink:href="ck0000880859-20241031.xsd#ck0000880859_ForeignSecuritiesRiskMember"/>  
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000880859_ForeignSecuritiesRiskMember" order="15" xbrldt:closed="true"/> 
    <loc xlink:type="locator" xlink:label="ck0000880859_GeographicFocusRiskMember" xlink:href="ck0000880859-20241031.xsd#ck0000880859_GeographicFocusRiskMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000880859_GeographicFocusRiskMember" order="16" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="ck0000880859_DepositaryReceiptsRiskMember" xlink:href="ck0000880859-20241031.xsd#ck0000880859_DepositaryReceiptsRiskMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000880859_DepositaryReceiptsRiskMember" order="17" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000880859_PreferredSecuritiesRiskMember" xlink:href="ck0000880859-20241031.xsd#ck0000880859_PreferredSecuritiesRiskMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000880859_PreferredSecuritiesRiskMember" order="18" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000880859_GrowthInvestingRiskMember" xlink:href="ck0000880859-20241031.xsd#ck0000880859_GrowthInvestingRiskMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000880859_GrowthInvestingRiskMember" order="19" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="ck0000880859_SmallAndMidCapitalizationCompaniesRiskMember" xlink:href="ck0000880859-20241031.xsd#ck0000880859_SmallAndMidCapitalizationCompaniesRiskMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000880859_SmallAndMidCapitalizationCompaniesRiskMember" order="20" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000880859_SectorFocusRiskMember" xlink:href="ck0000880859-20241031.xsd#ck0000880859_SectorFocusRiskMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000880859_SectorFocusRiskMember" order="21" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000880859_ManagementRiskMember" xlink:href="ck0000880859-20241031.xsd#ck0000880859_ManagementRiskMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000880859_ManagementRiskMember" order="22" xbrldt:closed="true"/>    
  </definitionLink>     
  <definitionLink xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasureOnly" xlink:type="extended">     
    <loc xlink:type="locator" xlink:label="oef_PerformanceMeasureDomain" xlink:href="https://xbrl.sec.gov/oef/2024/oef-2024.xsd#oef_PerformanceMeasureDomain"/>     
    <loc xlink:type="locator" xlink:label="ck0000880859_index_MSCI_All_Country_Asia_Pacific_exJapan_Index_Net_reflects_reinvested_dividends_net_of_withholding_taxes_but_reflects_no_deduction_for_fees_expenses_or_other_taxesMember" xlink:href="ck0000880859-20241031.xsd#ck0000880859_index_MSCI_All_Country_Asia_Pacific_exJapan_Index_Net_reflects_reinvested_dividends_net_of_withholding_taxes_but_reflects_no_deduction_for_fees_expenses_or_other_taxesMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_PerformanceMeasureDomain" xlink:to="ck0000880859_index_MSCI_All_Country_Asia_Pacific_exJapan_Index_Net_reflects_reinvested_dividends_net_of_withholding_taxes_but_reflects_no_deduction_for_fees_expenses_or_other_taxesMember" order="11" xbrldt:closed="true"/>  
  </definitionLink>     
</linkbase>
