who's who

noun

often capitalized both Ws
1
: a compilation of brief biographical sketches of prominent persons in a particular field
a who's who of sports figures
2
: the leaders of a group : elite
3
: a listing or grouping of notable persons or things

Examples of who's who in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The top of the finishing order was a who's who of 2025 championship contenders, as William Byron finished second, followed by Christopher Bell, Tyler Reddick, and Ryan Blaney. Thomas G. Moukawsher, MSNBC Newsweek, 13 Apr. 2025 The guest list is a who's who of the French elite Nancy Ing Reporting from Paris The guest list includes members of the French political elite, French millionaires and famous French actors. NBC News, 7 Dec. 2024 Blachowicz has fought against a who's who of the light heavyweight division. Thomas G. Moukawsher, Newsweek, 21 Mar. 2025 The group of 80 guests was made up, in part, of a who's who of Heat royalty, including owner Micky Arison, Heat president and former coach Pat Riley, alum Alonzo Mourning and power forward Duncan Robinson. Faisal Kutty, Newsweek, 10 Mar. 2025 See All Example Sentences for who's who

Word History

First Known Use

1917, in the meaning defined at sense 1

Time Traveler
The first known use of who's who was in 1917

Browse Nearby Words

Cite this Entry

“Who's who.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/who%27s%20who. Accessed 2 May. 2025.

More from Merriam-Webster on who's who

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!