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/usr/share/help/oc/gnome-dictionary/prob-retrieving-definition.page is in gnome-dictionary 3.10.0-1ubuntu1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="utf-8"?>
<page xmlns="http://projectmallard.org/1.0/" type="task" id="prob-retrieving-definition" xml:lang="oc">

  <info>
    <revision pkgversion="3.6" version="0.1" date="2013-03-30" status="candidate"/>
    <link type="guide" xref="index#troubleshooting"/>
    <link type="seealso" xref="definition"/>

    <credit type="author copyright">
      <name>Sindhu S</name>
      <email>sindhus@live.in</email>
      <years>2013</years>
    </credit>
    <credit type="copyright editor">
      <name>Ekaterina Gerasimova</name>
      <email>kittykat3756@gmail.com</email>
      <years>2013</years>
    </credit>

    <include xmlns="http://www.w3.org/2001/XInclude" href="legal.xml"/>

    <desc><sys>Error while retrieving definitions</sys>.</desc>

  </info>

  <title>Cannot find definitions</title>

  <p>If you see the error message
  <sys>Error while retrieving definition</sys> when looking up a definition
  from any of the <link xref="sources-select">selected dictionaries</link>,
  the problem is more likely one of the following:</p>

  <list>
    <item>
      <p>One or more of the selected <app>DICT</app> servers that are used to
      look up definitions may not be working. You can try waiting a while
      before <link xref="definition">looking up</link> the definition
      again.</p>
    </item>
    <item>
      <p>You may not have a working Internet connection. For
      <app>Dictionary</app> to look up terms, your computer
      <link href="help:gnome-help/net">must be able to connect</link> to
      <sys href="http://dict.org">dict.org</sys>.</p>
    </item>
  </list>

</page>