who's who Meaning in the Cambridge English Dictionary
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Meaning of “who's who” in the English Dictionary

"who's who" in British English

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who's who

the ​people who are most ​important in a ​particulargroup Who's Who a ​bookcontaininginformation about the world's ​richest or most ​famouspeople: The ​guestlistreads like a Who's Who of ​top American ​businessmen.
(Definition of who's who from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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