Allinanchor
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Allinanchor of a keyword is a Google command that searches Internet pages that contain the keyword in their anchor texts.
Anchor text is the text hyperlinked by a linking tag. For instance in HTML, <a href="http://en.wikipedia.org">Wikipedia in English"</a>, the anchor text is 'Wikipedia in English'.
A search in Google of 'allinanchor:wikipedia in english' (url 'http://www.google.com/search?q=allinanchor:wikipedia+in+english ') will return pages whose links contain the keywords 'wikipedia in english'.
The command allinanchor can be used in search engine optimisation projects to analyse the keywords and the context of backlinks to a certain site.