Dictionary![]() ![]() who's' who'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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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