(1):

(a.) Ready; especially fitted or qualified (to do something); quick to learn; prompt; expert; as, a pupil apt to learn; an apt scholar.

(2):

(a.) Inclined; disposed customarily; given; ready; - used of persons.

(3):

(a.) Having an habitual tendency; habitually liable or likely; - used of things.

(4):

(v. t.) To fit; to suit; to adapt.

(5):

(a.) Fit or fitted; suited; suitable; appropriate.