who-who

who's who

noun
1.
a reference work containing short biographical entries on the outstanding persons in a country, industry, profession, etc.: a who's who in automotive engineering.
2.
the outstanding or influential persons in a community, industry, profession, or other group: The who's who of racing will be there.

Origin:
1840–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
who's who
 
n
a book or list containing the names and short biographies of famous people

Collins English Dictionary - Complete & Unabridged 10th Edition
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