lightweight (Adjective) — Weighing relatively little compared with another item or object of similar use. ex. "a lightweight fabric" ex. "lightweight wood"
lightweight (Adjective) — Having no importance or influence. ex. "a lightweight intellect"
lightweight (Noun) — A professional boxer who weighs between 131 and 135 pounds.
lightweight (Noun) — Someone who is unimportant but cheeky and presumptuous.
lightweight (Noun) — An amateur boxer who weighs no more than 132 pounds.
lightweight (Noun) — A wrestler who weighs 139-154 pounds.