<?xml version="1.0" encoding="US-ASCII"?>
<!-- Generated by Broadridge Transform (tm) - http://www.broadridge.com -->
<!-- Created: Tue Jun 30 16:28:55 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"/>
  <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="ck0000919160_S000005895Member" xlink:href="ck0000919160-20251231.xsd#ck0000919160_S000005895Member"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="ck0000919160_S000005895Member" 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/2025/oef-2025.xsd#oef_ShareClassDomain"/>
    <loc xlink:type="locator" xlink:label="ck0000919160_C000016119Member" xlink:href="ck0000919160-20251231.xsd#ck0000919160_C000016119Member"/>
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000919160_C000016119Member" order="11" xbrldt:closed="true"/>
    <loc xlink:type="locator" xlink:label="ck0000919160_C000161072Member" xlink:href="ck0000919160-20251231.xsd#ck0000919160_C000161072Member"/>
<!-- [WMV7][1J4URT2EsxDhaYEAhnFaeLEsvQ7/gPWcMIUPob82KyMfPbh+zXZd2VyTMkMCP3IXlEeVAm4l353PpWEP7NhnOa+WW9GdHTw77iOV3R9FiFp6emFqlLUKdiwWHqm7XQ6XYZNGKmrek8NHCOeEN9+1NN7CCSsulGl6jcKXBYVHTkR8SphS6VCuk/SD45hWgxiQRmxf8hfJG2/UIV/opYaoV0D6qoSeeL4ab0ELAZMl0mm/r2gE00wR/WliQ4qMd2y2GF1JlkNk6HmNjj5FGLmHRrAy02SGPZQ9rYQY72QNp9k3iFOPTKRCKGHObyqO/t8PBweSdhmMGMTdLJ2eUNtLhaw8fBGrc44uK87XQ+GkgTZzPcieSVM=] CSR-->
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="oef_ShareClassDomain" xlink:to="ck0000919160_C000161072Member" order="12" xbrldt:closed="true"/>
  </definitionLink>
</linkbase>
