Definition of bantamweight noun from the Oxford Advanced American Dictionary

 

bantamweight

 noun
noun
NAmE//ˈbæntəmˌweɪt//
 
 
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a boxer weighing between 112 and 118 pounds (51-53.5 kg), or a wrestler who weighs between 114 and 125 pounds (52-57 kg) a bantamweight champion compare featherweight, flyweight
See the Oxford Advanced Learner's Dictionary entry: bantamweight