apt . noun [ C ] abbreviation for apartment (Definition of apt from the Cambridge Academic Content Dictionary © Cambridge University Press) The meaning of APT is unusually fitted or qualified : ready. How to use apt in a sentence. Definition of apt adjective in Oxford Advanced Learner's Dictionary. Meaning , pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Define apt . apt synonyms, apt pronunciation, apt translation, English dictionary definition of apt . adj. 1. Exactly suitable; appropriate: an apt reply. 2. Having a natural tendency; inclined: She is apt to take offense easily. See Usage Note at liable.
