Definitions from Wiktionary (lightweight)

▸ noun:  (combat sports) 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.
▸ noun:  (rowing) A particular weight category as prescribed by the rules, separate from an open or heavyweight class.
▸ noun:  (weightlifting) A competitive weight division as prescribed by the rules, between the heavier middleweight and the lighter featherweight.
▸ noun:  One of little consequence or ability.
▸ noun:  A person who cannot handle their drink; one who gets drunk on very little alcohol.
▸ noun:  (by extension) A person with low endurance.
▸ noun:  A political candidate with little chance of winning.
▸ adjective:  Lacking in earnestness, ability, or profundity.
▸ adjective:  Having less than average weight.
▸ adjective:  Lacking in strength.
▸ adjective:  (computing) Having a small footprint or performance impact.
▸ verb:  (transitive) To reduce the amount or weight of.
▸ Also see lightweight

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