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

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Who who is always a great word to know.
So is quincunx. Does it mean:
a chattering or flighty, light-headed person.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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