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who's

[hooz]
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  1. contraction of who is: Who's there?
  2. contraction of who has: Who's seen it?
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Can be confusedwho's whose (see usage note at whose)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for who's

who's

contraction of
  1. who is
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012