A program that determines the meaning of a term from the context in which it is used(noun)
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Use "disambiguator" in a sentence
"If multiple versions of a topic exists, you can find the disambiguator in the upper right hand corner of the topic."
"The MSDN Library content does get updated in response to customer feedback and sometimes completely rewritten for the latest version, so use the disambiguator box or bread crumbs to ensure that you're reading the most recent version of a topic."
"The definition, in particular, wouldn't move; I kept getting error messages that it already existed (with the disambiguator) but, as far as I could tell, it did not."