Definition of who pronoun from the Oxford Advanced Learner's Dictionary

      

    who

     pronoun
    pronoun
    BrE BrE//huː//
     
    ; NAmE NAmE//huː//
     
     
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  1. 1  used in questions to ask about the name, identity or function of one or more people Who is that woman? I wonder who that letter was from. Who are you phoning? Who's the money for?
  2. 2  used to show which person or people you mean The people who called yesterday want to buy the house. The people (who) we met in France have sent us a card.
  3. 3  used to give more information about somebody Mrs Smith, who has a lot of teaching experience at junior level, will be joining the school in September. And then Mary, who we had been talking about earlier, walked in.
  4. compare whom
    Word Origin Old English hwā, of Germanic origin; related to Dutch wie and German wer.Idioms
    who am I, who are you, etc. to do something?
     
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    used to ask what right or authority somebody has to do something Who are you to tell me I can't park here?
    people’s names, jobs, status, etc. You'll soon find out who's who in the office. see also who’s who
See the Oxford Advanced American Dictionary entry: who