Lightweight meaning : A particular weight class, or member of such, as prescribed by the rules, between that of the heavier welterweight and the lighter featherweight. See Wikipedia for the specifics of each sport. A particular weight category as prescribed by the rules, separate from an open or heavyweight class. A competitive weight division as prescribed by the rules, between the heavier middleweight and the lighter featherweight. One of little consequence or ability. A person who cannot handle their drink; one who gets drunk on very little alcohol. A political candidate with little chance of winning Lacking in earnestness, ability, or profundity Having less than average weight Lacking in strength Having a small footprint or performance impact