A Knight

(historical) A young servant or follower; a trained military attendant in service of a lord. https://en.wikipedia.org/wiki/Knight
(historical) A minor nobleman with an honourable military rank who had served as a page and squire.
(by extension) An armored and mounted warrior of the Middle Ages.
(modern) A person on whom a knighthood has been conferred by a monarch.
(literary) A brave, chivalrous and honorable man devoted to a noble cause or love interest.
(chess) A chess piece, often in the shape of a horse's head, that is moved two squares in one direction and one at right angles to that direction in a single move, leaping over any intervening pieces.
(card games, dated) A playing card bearing the figure of a knight; the knave or jack.
(entomology) Any of various nymphalid butterflies of the genus *Ypthima*.
(modern) A generic name for various mushrooms belonging to the order Agaricales, the gilled mushrooms; scientific name Tricholoma.