Definition of welterweight noun from the Oxford Advanced Learner's Dictionary

 

welterweight

 noun
noun
BrE BrE//ˈweltəweɪt//
 
; NAmE NAmE//ˈweltərweɪt//
 
 
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a boxer weighing between 61 and 67 kilograms, heavier than a lightweight a welterweight champion Word Origin early 19th cent.: welter of unknown origin.
See the Oxford Advanced American Dictionary entry: welterweight