Definitions
1.nounA 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.
2.nounA particular weight category as prescribed by the rules, separate from an open or heavyweight class.
3.nounA competitive weight division as prescribed by the rules, between the heavier middleweight and the lighter featherweight.
4.nounOne of little consequence or ability.
5.nounA person who cannot handle their drink; one who gets drunk on very little alcohol.
6.nounA political candidate with little chance of winning
7.adjectiveLacking in earnestness, ability, or profundity
8.adjectiveHaving less than average weight
9.adjectiveLacking in strength
10.adjectiveHaving a small footprint or performance impact