Knight n. : A young servant or follower; a military attendant.

Knight n. : In feudal times, a man-at-arms serving on horseback and admitted to a certain military rank with special ceremonies, including an oath to protect the distressed, maintain the right, and live a stainless life.

Knight n. : One on whom knighthood, a dignity next below that of baronet, is conferred by the sovereign, entitling him to be addressed as Sir; as, Sir John.

Knight n. : A champion; a partisan; a lover.

Knight n. : A piece used in the game of chess, usually bearing a horse's head.

Knight n. : A playing card bearing the figure of a knight; the knave or jack.

Knight v. t. : To dub or create (one) a knight; -- done in England by the sovereign only, who taps the kneeling candidate with a sword, saying: Rise, Sir ---.

Example:
How would a person kill a medieval Knight?

Taxonomy
knight, knighthood, chivalry, Dame, battle, horse, king, warriors, orders of knighthood, military, honours, armies, honorific, 04-07, London, accolade, medieval knight, code of chivalry.

Defination from the web:
... This class is often translated as "knight"; the medieval knight, however, was called miles in Latin, (which in classical Latin meant "soldier" ...