who's who definition, meaning - what is who's who in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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English definition of “who's who”

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who's who

the name and position of each person, especially in an organization Who's Who a book containing information about the world's richest or most famous people: The guest list reads like a Who's Who of top American businessmen.
(Definition of who's who from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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