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Definition of heavyweight noun from the Oxford Advanced American Dictionary

     

    heavyweight

     noun
    noun
    NAmE//ˈhɛviˌweɪt//
     
     
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  1. 1 a boxer of the heaviest class in normal use, weighing 175 pounds or more a heavyweight champion
  2. 2a person or thing that weighs more than is usual
  3. 3a very important person, organization, or thing that influences others a political heavyweight a heavyweight journal
See the Oxford Advanced Learner's Dictionary entry: heavyweight