who's
contraction
\ ˈhüz
\
\
Definition of who's
1
: who is
Who's there? I don't know who's calling.
2
: who has
She's someone who's always been a good friend to me.
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“Who's.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/who%27s. Accessed 5 Mar. 2021.
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The first known use of who's was in 1594
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