<?xml version="1.0" encoding="US-ASCII"?>  
<!-- Generated by CompSci Transform (tm) - http://www.compsciresources.com -->    
<!-- Created: Sun Feb 22 11:17:42 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/oef/2025/oef-2025.xsd#SeriesOnly" roleURI="http://xbrl.sec.gov/oef/role/SeriesOnly"/>     
  <roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ClassOnly" roleURI="http://xbrl.sec.gov/oef/role/ClassOnly"/>   
  <roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#RiskOnly" roleURI="http://xbrl.sec.gov/rr/role/RiskOnly"/>     
  <roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.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/2025/dei-2025.xsd#dei_EntityDomain"/> 
    <loc xlink:type="locator" xlink:label="ck0000826644_S000025654Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_S000025654Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000826644_S000025654Member" order="11" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_S000030111Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_S000030111Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000826644_S000030111Member" order="12" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_S000064702Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_S000064702Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000826644_S000064702Member" order="13" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_S000064706Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_S000064706Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000826644_S000064706Member" order="14" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_S000064710Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_S000064710Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000826644_S000064710Member" order="15" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_S000000234Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_S000000234Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000826644_S000000234Member" order="16" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_S000064693Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_S000064693Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000826644_S000064693Member" order="17" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_S000064695Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_S000064695Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000826644_S000064695Member" order="18" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_S000064708Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_S000064708Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000826644_S000064708Member" order="19" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_S000000235Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_S000000235Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000826644_S000000235Member" order="20" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_S000064709Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_S000064709Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000826644_S000064709Member" order="21" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_S000035024Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_S000035024Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000826644_S000035024Member" order="22" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_S000064696Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_S000064696Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000826644_S000064696Member" order="23" 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/2025/oef-2025.xsd#oef_ShareClassDomain"/>    
    <loc xlink:type="locator" xlink:label="ck0000826644_C000076836Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000076836Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000076836Member" order="11" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000076838Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000076838Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000076838Member" order="12" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000076839Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000076839Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000076839Member" order="13" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000076840Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000076840Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000076840Member" order="14" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000076841Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000076841Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000076841Member" order="15" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000120702Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000120702Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000120702Member" order="16" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000092474Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000092474Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000092474Member" order="17" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000092476Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000092476Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000092476Member" order="18" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000092477Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000092477Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000092477Member" order="19" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000092478Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000092478Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000092478Member" order="20" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000092479Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000092479Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000092479Member" order="21" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000120704Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000120704Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000120704Member" order="22" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209594Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209594Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209594Member" order="23" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209593Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209593Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209593Member" order="24" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209592Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209592Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209592Member" order="25" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209591Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209591Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209591Member" order="26" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209590Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209590Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209590Member" order="27" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209589Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209589Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209589Member" order="28" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209615Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209615Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209615Member" order="29" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209617Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209617Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209617Member" order="30" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209616Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209616Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209616Member" order="31" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209618Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209618Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209618Member" order="32" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209614Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209614Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209614Member" order="33" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209613Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209613Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209613Member" order="34" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209639Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209639Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209639Member" order="35" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209641Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209641Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209641Member" order="36" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209640Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209640Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209640Member" order="37" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209642Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209642Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209642Member" order="38" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209638Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209638Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209638Member" order="39" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209637Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209637Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209637Member" order="40" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000000562Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000000562Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000000562Member" order="41" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000000564Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000000564Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000000564Member" order="42" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000071223Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000071223Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000071223Member" order="43" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000029646Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000029646Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000029646Member" order="44" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000120699Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000120699Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000120699Member" order="45" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209537Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209537Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209537Member" order="46" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209539Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209539Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209539Member" order="47" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209538Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209538Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209538Member" order="48" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209540Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209540Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209540Member" order="49" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209536Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209536Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209536Member" order="50" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209535Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209535Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209535Member" order="51" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209552Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209552Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209552Member" order="52" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209548Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209548Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209548Member" order="53" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209547Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209547Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209547Member" order="54" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209549Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209549Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209549Member" order="55" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209550Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209550Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209550Member" order="56" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209551Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209551Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209551Member" order="57" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209627Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209627Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209627Member" order="58" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209629Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209629Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209629Member" order="59" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209628Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209628Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209628Member" order="60" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209630Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209630Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209630Member" order="61" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209626Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209626Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209626Member" order="62" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209625Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209625Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209625Member" order="63" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000000565Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000000565Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000000565Member" order="64" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000000567Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000000567Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000000567Member" order="65" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000265799Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000265799Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000265799Member" order="66" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000071224Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000071224Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000071224Member" order="67" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000029647Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000029647Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000029647Member" order="68" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000188882Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000188882Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000188882Member" order="69" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209633Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209633Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209633Member" order="70" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209635Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209635Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209635Member" order="71" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209634Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209634Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209634Member" order="72" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209636Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209636Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209636Member" order="73" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209632Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209632Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209632Member" order="74" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209631Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209631Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209631Member" order="75" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000107688Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000107688Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000107688Member" order="76" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000107689Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000107689Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000107689Member" order="77" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000107690Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000107690Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000107690Member" order="78" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000107691Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000107691Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000107691Member" order="79" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000107692Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000107692Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000107692Member" order="80" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000120706Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000120706Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000120706Member" order="81" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209558Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209558Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209558Member" order="82" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209557Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209557Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209557Member" order="83" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209556Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209556Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209556Member" order="84" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209555Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209555Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209555Member" order="85" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209554Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209554Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209554Member" order="86" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_C000209553Member" xlink:href="ck0000826644-20260226.xsd#ck0000826644_C000209553Member"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000826644_C000209553Member" order="87" xbrldt:closed="true"/>  
  </definitionLink>     
  <definitionLink xlink:role="http://xbrl.sec.gov/rr/role/RiskOnly" xlink:type="extended"> 
    <loc xlink:type="locator" xlink:label="oef_AllRisksMember" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_AllRisksMember"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_MarketRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_MarketRiskMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_MarketRiskMember" order="11" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_HealthCareSectorRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_HealthCareSectorRiskMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_HealthCareSectorRiskMember" order="12" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_CorrelationRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_CorrelationRiskMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_CorrelationRiskMember" order="13" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_SectorFocusRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_SectorFocusRiskMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_SectorFocusRiskMember" order="14" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_IssuerFocusRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_IssuerFocusRiskMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_IssuerFocusRiskMember" order="15" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_InvestingInThePrivateFundRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_InvestingInThePrivateFundRiskMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_InvestingInThePrivateFundRiskMember" order="16" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="ck0000826644_PreferredSecuritiesRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_PreferredSecuritiesRiskMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_PreferredSecuritiesRiskMember" order="17" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_ConvertibleSecuritiesRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_ConvertibleSecuritiesRiskMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_ConvertibleSecuritiesRiskMember" order="18" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_RightsAndWarrantsRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_RightsAndWarrantsRiskMember"/>  
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_RightsAndWarrantsRiskMember" order="19" xbrldt:closed="true"/> 
    <loc xlink:type="locator" xlink:label="ck0000826644_DepositaryReceiptsRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_DepositaryReceiptsRiskMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_DepositaryReceiptsRiskMember" order="20" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_LimitedPartnerRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_LimitedPartnerRiskMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_LimitedPartnerRiskMember" order="21" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_EquitySecuritiesRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_EquitySecuritiesRiskMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_EquitySecuritiesRiskMember" order="22" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_DerivativesRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_DerivativesRiskMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_DerivativesRiskMember" order="23" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_WhenIssuedDelayedDeliveryAndForwardCommitmentRisksMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_WhenIssuedDelayedDeliveryAndForwardCommitmentRisksMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_WhenIssuedDelayedDeliveryAndForwardCommitmentRisksMember" order="24" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_TBATransactionsRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_TBATransactionsRiskMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_TBATransactionsRiskMember" order="25" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="ck0000826644_DollarRollTransactionsRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_DollarRollTransactionsRiskMember"/>  
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_DollarRollTransactionsRiskMember" order="26" xbrldt:closed="true"/> 
    <loc xlink:type="locator" xlink:label="ck0000826644_LiquidityRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_LiquidityRiskMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_LiquidityRiskMember" order="27" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="us-gaap_InterestRateRiskMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateRiskMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="us-gaap_InterestRateRiskMember" order="28" xbrldt:closed="true"/> 
    <loc xlink:type="locator" xlink:label="ck0000826644_GeneralPartnerRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_GeneralPartnerRiskMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_GeneralPartnerRiskMember" order="29" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_MLPTaxRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_MLPTaxRiskMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_MLPTaxRiskMember" order="30" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_IndexingRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_IndexingRiskMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_IndexingRiskMember" order="31" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_NonCorrelationRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_NonCorrelationRiskMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_NonCorrelationRiskMember" order="32" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_SamplingRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_SamplingRiskMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_SamplingRiskMember" order="33" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_ActiveTradingRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_ActiveTradingRiskMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_ActiveTradingRiskMember" order="34" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_InvestingInStocksRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_InvestingInStocksRiskMember"/>  
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_InvestingInStocksRiskMember" order="35" xbrldt:closed="true"/> 
    <loc xlink:type="locator" xlink:label="ck0000826644_DebtSecuritiesRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_DebtSecuritiesRiskMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_DebtSecuritiesRiskMember" order="36" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_UnratedSecuritiesRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_UnratedSecuritiesRiskMember"/>  
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_UnratedSecuritiesRiskMember" order="37" xbrldt:closed="true"/> 
    <loc xlink:type="locator" xlink:label="ck0000826644_CommodityRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_CommodityRiskMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_CommodityRiskMember" order="38" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_CommoditiesTaxRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_CommoditiesTaxRiskMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_CommoditiesTaxRiskMember" order="39" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_ChangingFixedIncomeMarketConditionsRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_ChangingFixedIncomeMarketConditionsRiskMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_ChangingFixedIncomeMarketConditionsRiskMember" order="40" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="ck0000826644_HighYieldDebtSecuritiesJunkBondRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_HighYieldDebtSecuritiesJunkBondRiskMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_HighYieldDebtSecuritiesJunkBondRiskMember" order="41" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_DefaultedSecuritiesRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_DefaultedSecuritiesRiskMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_DefaultedSecuritiesRiskMember" order="42" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_CreditLinkedNotesRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_CreditLinkedNotesRiskMember"/>  
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_CreditLinkedNotesRiskMember" order="43" xbrldt:closed="true"/> 
    <loc xlink:type="locator" xlink:label="ck0000826644_BankLoanRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_BankLoanRiskMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_BankLoanRiskMember" order="44" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_DividendRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_DividendRiskMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_DividendRiskMember" order="45" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_ESGConsiderationsRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_ESGConsiderationsRiskMember"/>  
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_ESGConsiderationsRiskMember" order="46" xbrldt:closed="true"/> 
    <loc xlink:type="locator" xlink:label="ck0000826644_NonDiversificationRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_NonDiversificationRiskMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_NonDiversificationRiskMember" order="47" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_ForeignInvestmentRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_ForeignInvestmentRiskMember"/>  
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_ForeignInvestmentRiskMember" order="48" xbrldt:closed="true"/> 
    <loc xlink:type="locator" xlink:label="ck0000826644_EmergingMarketsInvestmentRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_EmergingMarketsInvestmentRiskMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_EmergingMarketsInvestmentRiskMember" order="49" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="ck0000826644_EuropeanInvestmentRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_EuropeanInvestmentRiskMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_EuropeanInvestmentRiskMember" order="50" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_GeographicFocusRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_GeographicFocusRiskMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_GeographicFocusRiskMember" order="51" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="ck0000826644_AsiaPacificRegionRiskexChinaMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_AsiaPacificRegionRiskexChinaMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_AsiaPacificRegionRiskexChinaMember" order="52" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_AsiaPacificRegionRiskexJapanMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_AsiaPacificRegionRiskexJapanMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_AsiaPacificRegionRiskexJapanMember" order="53" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_GrowthInvestingRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_GrowthInvestingRiskMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_GrowthInvestingRiskMember" order="54" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="ck0000826644_ValueInvestingRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_ValueInvestingRiskMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_ValueInvestingRiskMember" order="55" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_SmallAndMidCapitalizationCompaniesRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_SmallAndMidCapitalizationCompaniesRiskMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_SmallAndMidCapitalizationCompaniesRiskMember" order="56" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_InvestmentCompaniesRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_InvestmentCompaniesRiskMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_InvestmentCompaniesRiskMember" order="57" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_FinancialsSectorRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_FinancialsSectorRiskMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_FinancialsSectorRiskMember" order="58" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_ForeignGovernmentDebtRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_ForeignGovernmentDebtRiskMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_ForeignGovernmentDebtRiskMember" order="59" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_ForeignCurrencyTaxRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_ForeignCurrencyTaxRiskMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_ForeignCurrencyTaxRiskMember" order="60" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_AlternativeInvestmentStrategiesRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_AlternativeInvestmentStrategiesRiskMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_AlternativeInvestmentStrategiesRiskMember" order="61" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_CommodityLinkedNotesRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_CommodityLinkedNotesRiskMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_CommodityLinkedNotesRiskMember" order="62" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="ck0000826644_ShortPositionRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_ShortPositionRiskMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_ShortPositionRiskMember" order="63" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_ExchangeTradedFundsRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_ExchangeTradedFundsRiskMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_ExchangeTradedFundsRiskMember" order="64" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_AssetAllocationRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_AssetAllocationRiskMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_AssetAllocationRiskMember" order="65" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="ck0000826644_AffiliatedPortfolioRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_AffiliatedPortfolioRiskMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_AffiliatedPortfolioRiskMember" order="66" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_ExchangeTradedNotesRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_ExchangeTradedNotesRiskMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_ExchangeTradedNotesRiskMember" order="67" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_FactorBasedStrategyRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_FactorBasedStrategyRiskMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_FactorBasedStrategyRiskMember" order="68" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_QuantitativeModelsRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_QuantitativeModelsRiskMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_QuantitativeModelsRiskMember" order="69" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_VolatilityRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_VolatilityRiskMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_VolatilityRiskMember" order="70" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="ck0000826644_Rule144ASecuritiesAndOtherExemptSecuritiesRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_Rule144ASecuritiesAndOtherExemptSecuritiesRiskMember"/>  
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_Rule144ASecuritiesAndOtherExemptSecuritiesRiskMember" order="71" xbrldt:closed="true"/> 
    <loc xlink:type="locator" xlink:label="ck0000826644_EquityLinkedNotesRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_EquityLinkedNotesRiskMember"/>  
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_EquityLinkedNotesRiskMember" order="72" xbrldt:closed="true"/> 
    <loc xlink:type="locator" xlink:label="ck0000826644_EventLinkedSecuritiesRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_EventLinkedSecuritiesRiskMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_EventLinkedSecuritiesRiskMember" order="73" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_RestrictedSecuritiesRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_RestrictedSecuritiesRiskMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_RestrictedSecuritiesRiskMember" order="74" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="ck0000826644_MortgageAndAssetBackedSecuritiesRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_MortgageAndAssetBackedSecuritiesRiskMember"/>  
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_MortgageAndAssetBackedSecuritiesRiskMember" order="75" xbrldt:closed="true"/> 
    <loc xlink:type="locator" xlink:label="ck0000826644_ZeroCouponAndStrippedSecuritiesRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_ZeroCouponAndStrippedSecuritiesRiskMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_ZeroCouponAndStrippedSecuritiesRiskMember" order="76" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_SubsidiaryRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_SubsidiaryRiskMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_SubsidiaryRiskMember" order="77" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="ck0000826644_RegulationSSecuritiesRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_RegulationSSecuritiesRiskMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_RegulationSSecuritiesRiskMember" order="78" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_REITRiskRealEstateRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_REITRiskRealEstateRiskMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_REITRiskRealEstateRiskMember" order="79" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_InvestmentsInMiningMineralsAndMetalIndustrySecuritiesRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_InvestmentsInMiningMineralsAndMetalIndustrySecuritiesRiskMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_InvestmentsInMiningMineralsAndMetalIndustrySecuritiesRiskMember" order="80" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_SeniorLoansAndOtherLoansRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_SeniorLoansAndOtherLoansRiskMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_SeniorLoansAndOtherLoansRiskMember" order="81" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_MoneyMarketFundRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_MoneyMarketFundRiskMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_MoneyMarketFundRiskMember" order="82" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="ck0000826644_USGovernmentObligationsRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_USGovernmentObligationsRiskMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_USGovernmentObligationsRiskMember" order="83" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_ValuationRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_ValuationRiskMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_ValuationRiskMember" order="84" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_ManagementRiskMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_ManagementRiskMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_AllRisksMember" xlink:to="ck0000826644_ManagementRiskMember" order="85" 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/2025/oef-2025.xsd#oef_PerformanceMeasureDomain"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_index_Custom_Invesco_Balanced_Risk_Allocation_Style_Index_is_composed_of_60_MSCI_World_Index_Net_reflects_reinvested_dividends_net_of_withholding_taxes_but_reflects_no_deduction_for_fees_expenseMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_Custom_Invesco_Balanced_Risk_Allocation_Style_Index_is_composed_of_60_MSCI_World_Index_Net_reflects_reinvested_dividends_net_of_withholding_taxes_but_reflects_no_deduction_for_fees_expenseMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_PerformanceMeasureDomain" xlink:to="ck0000826644_index_Custom_Invesco_Balanced_Risk_Allocation_Style_Index_is_composed_of_60_MSCI_World_Index_Net_reflects_reinvested_dividends_net_of_withholding_taxes_but_reflects_no_deduction_for_fees_expenseMember" order="11" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="ck0000826644_index_MSCI_ACWI_Index_Net_reflects_reinvested_dividends_net_of_withholding_taxes_but_reflects_no_deduction_for_fees_expenses_or_other_taxesMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_MSCI_ACWI_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="ck0000826644_index_MSCI_ACWI_Index_Net_reflects_reinvested_dividends_net_of_withholding_taxes_but_reflects_no_deduction_for_fees_expenses_or_other_taxesMember" order="12" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="ck0000826644_index_Bloomberg_Commodity_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_Bloomberg_Commodity_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_PerformanceMeasureDomain" xlink:to="ck0000826644_index_Bloomberg_Commodity_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" order="13" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_index_Bloomberg_Global_Aggregate_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_Bloomberg_Global_Aggregate_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_PerformanceMeasureDomain" xlink:to="ck0000826644_index_Bloomberg_Global_Aggregate_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" order="14" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_index_Bloomberg_US_Aggregate_Bond_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_Bloomberg_US_Aggregate_Bond_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_PerformanceMeasureDomain" xlink:to="ck0000826644_index_Bloomberg_US_Aggregate_Bond_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" order="15" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_index_Bloomberg_US_Credit_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_Bloomberg_US_Credit_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_PerformanceMeasureDomain" xlink:to="ck0000826644_index_Bloomberg_US_Credit_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" order="16" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_index_FTSE_Broad_Investment_Grade_Bond_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_FTSE_Broad_Investment_Grade_Bond_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_PerformanceMeasureDomain" xlink:to="ck0000826644_index_FTSE_Broad_Investment_Grade_Bond_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" order="17" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_index_MSCI_Emerging_Markets_Index_Net_reflects_reinvested_dividends_net_of_withholding_taxes_but_reflects_no_deduction_for_fees_expenses_or_other_taxesMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_MSCI_Emerging_Markets_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="ck0000826644_index_MSCI_Emerging_Markets_Index_Net_reflects_reinvested_dividends_net_of_withholding_taxes_but_reflects_no_deduction_for_fees_expenses_or_other_taxesMember" order="18" xbrldt:closed="true"/> 
    <loc xlink:type="locator" xlink:label="ck0000826644_index_Russell_Midcap_Growth_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_Russell_Midcap_Growth_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_PerformanceMeasureDomain" xlink:to="ck0000826644_index_Russell_Midcap_Growth_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" order="19" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_index_SP_500_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_SP_500_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_PerformanceMeasureDomain" xlink:to="ck0000826644_index_SP_500_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" order="20" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_index_MSCI_Emerging_Markets_ex_China_Index_Net_reflects_reinvested_dividends_net_of_withholding_taxes_but_reflects_no_deduction_for_fees_expenses_or_other_taxesMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_MSCI_Emerging_Markets_ex_China_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="ck0000826644_index_MSCI_Emerging_Markets_ex_China_Index_Net_reflects_reinvested_dividends_net_of_withholding_taxes_but_reflects_no_deduction_for_fees_expenses_or_other_taxesMember" order="21" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_index_JP_Morgan_Government_Bond_Index_Emerging_Markets_GBIEM_Global_Diversified_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_JP_Morgan_Government_Bond_Index_Emerging_Markets_GBIEM_Global_Diversified_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_PerformanceMeasureDomain" xlink:to="ck0000826644_index_JP_Morgan_Government_Bond_Index_Emerging_Markets_GBIEM_Global_Diversified_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" order="22" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="ck0000826644_index_Bloomberg_Global_Aggregate_exUS_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_Bloomberg_Global_Aggregate_exUS_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_PerformanceMeasureDomain" xlink:to="ck0000826644_index_Bloomberg_Global_Aggregate_exUS_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" order="23" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_index_Custom_Invesco_Global_Allocation_Index_is_composed_of_60_MSCI_ACWI_Index_Net_reflects_reinvested_dividends_net_of_withholding_taxes_but_reflects_no_deduction_for_fees_expenses_or_other_taxMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_Custom_Invesco_Global_Allocation_Index_is_composed_of_60_MSCI_ACWI_Index_Net_reflects_reinvested_dividends_net_of_withholding_taxes_but_reflects_no_deduction_for_fees_expenses_or_other_taxMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_PerformanceMeasureDomain" xlink:to="ck0000826644_index_Custom_Invesco_Global_Allocation_Index_is_composed_of_60_MSCI_ACWI_Index_Net_reflects_reinvested_dividends_net_of_withholding_taxes_but_reflects_no_deduction_for_fees_expenses_or_other_taxMember" order="24" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="ck0000826644_index_Bloomberg_Global_Aggregate_USD_Hedged_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_Bloomberg_Global_Aggregate_USD_Hedged_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_PerformanceMeasureDomain" xlink:to="ck0000826644_index_Bloomberg_Global_Aggregate_USD_Hedged_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" order="25" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="ck0000826644_index_SP_Composite_1500_Health_Care_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_SP_Composite_1500_Health_Care_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_PerformanceMeasureDomain" xlink:to="ck0000826644_index_SP_Composite_1500_Health_Care_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" order="26" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_index_MSCI_World_Health_Care_Index_Net_reflects_reinvested_dividends_net_of_withholding_taxes_but_reflects_no_deduction_for_fees_expenses_or_other_taxesMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_MSCI_World_Health_Care_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="ck0000826644_index_MSCI_World_Health_Care_Index_Net_reflects_reinvested_dividends_net_of_withholding_taxes_but_reflects_no_deduction_for_fees_expenses_or_other_taxesMember" order="27" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_index_MSCI_World_IndexSM_Net_reflects_reinvested_dividends_net_of_withholding_taxes_but_reflects_no_deduction_for_fees_expenses_or_other_taxesMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_MSCI_World_IndexSM_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="ck0000826644_index_MSCI_World_IndexSM_Net_reflects_reinvested_dividends_net_of_withholding_taxes_but_reflects_no_deduction_for_fees_expenses_or_other_taxesMember" order="28" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="ck0000826644_index_FTSE_NonUS_Dollar_World_Government_Bond_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_FTSE_NonUS_Dollar_World_Government_Bond_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_PerformanceMeasureDomain" xlink:to="ck0000826644_index_FTSE_NonUS_Dollar_World_Government_Bond_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" order="29" xbrldt:closed="true"/>     
    <loc xlink:type="locator" xlink:label="ck0000826644_index_Custom_Invesco_International_Bond_Index_50_FTSE_NonUS_Dollar_World_Government_Bond_Index_30_JP_Morgan_Government_Bond_IndexEmerging_Markets_Global_Diversified_Index_and_20_JP_Morgan_EMBI_GMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_Custom_Invesco_International_Bond_Index_50_FTSE_NonUS_Dollar_World_Government_Bond_Index_30_JP_Morgan_Government_Bond_IndexEmerging_Markets_Global_Diversified_Index_and_20_JP_Morgan_EMBI_GMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_PerformanceMeasureDomain" xlink:to="ck0000826644_index_Custom_Invesco_International_Bond_Index_50_FTSE_NonUS_Dollar_World_Government_Bond_Index_30_JP_Morgan_Government_Bond_IndexEmerging_Markets_Global_Diversified_Index_and_20_JP_Morgan_EMBI_GMember" order="30" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="ck0000826644_index_JP_Morgan_EMBI_Global_Diversified_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_JP_Morgan_EMBI_Global_Diversified_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_PerformanceMeasureDomain" xlink:to="ck0000826644_index_JP_Morgan_EMBI_Global_Diversified_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" order="31" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="ck0000826644_index_Custom_Invesco_MultiAsset_Income_Index_is_composed_of_60_of_the_Bloomberg_US_Aggregate_Bond_Index_reflects_no_deduction_for_fees_expenses_or_taxes_and_40_of_the_MSCI_World_Index_Net_reflecMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_Custom_Invesco_MultiAsset_Income_Index_is_composed_of_60_of_the_Bloomberg_US_Aggregate_Bond_Index_reflects_no_deduction_for_fees_expenses_or_taxes_and_40_of_the_MSCI_World_Index_Net_reflecMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_PerformanceMeasureDomain" xlink:to="ck0000826644_index_Custom_Invesco_MultiAsset_Income_Index_is_composed_of_60_of_the_Bloomberg_US_Aggregate_Bond_Index_reflects_no_deduction_for_fees_expenses_or_taxes_and_40_of_the_MSCI_World_Index_Net_reflecMember" order="32" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="ck0000826644_index_HFRX_Global_Hedge_Fund_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" xlink:href="ck0000826644-20260226.xsd#ck0000826644_index_HFRX_Global_Hedge_Fund_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember"/> 
<!-- [WMV6][H0R5RYfGgpRcHCwnDjPoGi1O0Fk3jz+SMtpBNbhsSFmDDDeWbi9MPzGykPG8stKzuHVyFURdarmuut1n2qmkQxgWX20GtX4mS3OUnk0pCNI2WBOWwgzgMSiX7D719MaLMRmWSd5HozamyxiA7O+xuSiOO1md2uQg8qx/WC/O+3bHhKPe6yc+DiFQzcuvRgSLALPi0IX92LCET0W88SiSXkRdMW8gi80tjgMExuaSjJz9XI6JfiESy5ZC5+pnTnqFEc8f7wxr4vMz65b6MMBK2R0z3GOyr5SiADig70vfMaIWTAFZRwExqI5n/zIFOMu8nMirpjVrQvnUKHAezegrdE3QLnrr/TrJrQOy1yO1wxnuH2UZdlqI8/49K1+CjB4lAz99g14qlciUwTn1grUY24Jpj6g=] CSR-->   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_PerformanceMeasureDomain" xlink:to="ck0000826644_index_HFRX_Global_Hedge_Fund_Index_reflects_no_deduction_for_fees_expenses_or_taxesMember" order="33" xbrldt:closed="true"/>   
  </definitionLink>     
</linkbase>
