adj. a prize fighter, boxer, wrestler, or jockey, who is below a standard medium weight. Cf. Feather weight, under Feather.n. One of less than average weightn. A person of small importance or mental ability, especially one who is unimportant but cheeky and presumptuous.n. a wrestler who weighs 139-154 pounds.adj. Light in weight, as a coin; specif., applied to a man or animal who is a lightweight.adj. made of thin cloth, of relatively little weight; -- of clothing or fabrics.n.