1. (adj)apt(p), disposed(p), given(p), minded(p), tending(p) (usually followed by `to') naturally disposed toward
"he is apt to ignore matters he considers unimportant"; "I am not minded to answer any questions"
2. (adj)apt(p), liable(p) at risk of or subject to experiencing something usually unpleasant
"he is apt to lose"; "she is liable to forget"
3. (adj)apt, clever mentally quick and resourceful
"an apt pupil"; "you are a clever man...you reason well and your wit is bold"-Bram Stoker
4. (adj)apposite, apt, pertinent being of strikingappropriateness and pertinence "the successful copywriter is a master of apposite and evocative verbal images"; "an apt reply"
Definition of 'APT'
