[light.weight] n (1773) 1: one of less than average weight; specif: a boxer in a weight division having a maximum limit of 135 pounds for professionals and 132 pounds for amateurs
2: one of little consequence or ability "shows up its author as a ~ --C. J. Rolo"
[2]lightweight adj (1809) 1: lacking in earnestness, ability, or profundity: inconsequential
2: having less than average weight
3: of, relating to, or characteristic of a lightweight "the ~ championship"