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who

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who/ˈhuː/pronoun
who
/ˈhuː/
pronoun
Learner's definition of WHO  
: what or which person or people — used when you do not know the name or identity of a person or group of people that you are talking about or asking about
   b  — used to question a person's character or authority
   c  — used in questions that are meant to say that no one would or would not do something, know something, etc.
Usagesee:whom'
— used after a noun or pronoun to show which group of people you are talking about
— used to introduce an additional statement about someone who has already been mentioned

who's who

orwho is who
: information about the people who make up a group
: a list of the names of the important and well-known people in a particular field
   b  : the important and well-known people in a particular field
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