1. Being of striking appropriateness and pertinence
   "an apt reply";
   - apposite, pertinent
    
2. (usually followed by 'to') naturally disposed toward
   "he is apt to ignore matters he considers unimportant";
   - disposed, given, minded, tending
    
3. Mentally quick and resourceful
   "an apt pupil";
   - clever
    
4. At risk of or subject to experiencing something usually unpleasant
   "he is apt to lose";
   - liable

Derived forms: aptest, apter

See also: apropos, inclined, intelligent, likely

Encyclopedia: Apt, Vaucluse