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

british dictionary

"who's who" in British English

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who's who

the people who are most important in a particular group

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 Learner’s Dictionary & Thesaurus © Cambridge University Press)