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English definition of “heavyweight”

heavyweight

noun [C]     /ˈhev.ɪ.weɪt/
a boxer who weighs more than 175 pounds (79.5 kilograms ) and is therefore in the heaviest group : Mike Tyson was heavyweight champion of the world . → Compare lightweight adjectiveBoxing a person or thing that is important or serious and that other people notice : Her extraordinary intelligence and speaking ability made her a political heavyweight.Important people and describing important peopleFamous peopleWealthy peopleImportant and essential thingsInformation and messages
(Definition of heavyweight noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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