The meaning of WHAT is —used as an interrogative expressing inquiry about the identity, nature, or value of an object or matter. How to use what in a sentence. used with a noun in requesting further information about the identity or categorization of something b. Click for more definitions. Definition of what pronoun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. 2 days ago · A diploma in the waiting room revealed Big Boy to be a member of The American Association of Medical Hydrology, whatever that might be. Furthermore he was a deacon of the … WHAT meaning: 1. used to ask for information about people or things: 2. used in questions that show you are…. From Longman Dictionary of Contemporary English what /wɒt $ wɑːt, wʌt/ S1 W1 pronoun, determiner, predeterminer 1 used to ask for information or for someone’s opinion What are you doing? What … what /hwʌt, hwɑt, wʌt, wɑt; unstressed hwət, wət/ pron. (used in questions as a request for information): What is your phone number? What is your wife's name? (used in questions to … WHAT definition: 1.