We will try our best to disambiguate the following definition: to disambiguate is to make a sentence or phrase perfectly clear by removing all uncertainty.
Disambiguate is another way to say "clarify," and it's most commonly used to talk about language, linguistics, or the law. A scholar might disambiguate two similar terms by clearly defining them in the paper she's writing. Websites like Wikipedia disambiguate in a similar way, especially when one word, phrase, or name has several different meanings.