adj., n., & v.
adj. 1 brave, chivalrous. 2 a (of a ship, horse, etc.) grand, fine, stately. b archaic finely dressed. 3 a markedly attentive to women. b concerned with sexual love; amatory.
n. 1 a ladies' man; a lover or paramour. 2 archaic a man of fashion; a fine gentleman.
v. 1 tr. flirt with. 2 tr. escort; act as a cavalier to (a lady). 3 intr. a play the gallant. b (foll. by with) flirt. gallantly adv.
[ ME f. OF galant part. of galer make merry ]