- (boxing) A boxer in a weight division having a maximum limit of 135 pounds for professionals and 132 pounds for amateurs.
- (bodybuilding) A competitive weight division between bantamweight and welterweight, with specific weights varying by organization.
- One of little consequence or ability.
- A person who can't handle their drink.
Etymology: light + weight
- Lacking in earnestness, ability, or profundity
- Having less than average weight
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Full Definition of lightweight