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English definition of “who”

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who

pronoun uk   /huː/ us  

who pronoun (QUESTIONS)

A1 used especially in questions as the subject or object of a verb, when asking which person or people, or when asking what someone's name is: Who did this? Who's she? Who are all those people? She asked me if I knew who had got the job. Who (also formal whom) do you want to talk to? I don't know who to ask to the party. used with verbs that relate to knowing, when you want to say that something is not known: "Are they going to get married?" "Who knows?" (= It is not possible to know at the moment.) Who can tell what will happen now?
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who pronoun (USED TO REFER)

A2 used as the subject or object of a verb to show which person you are referring to, or to add information about a person just mentioned. It is used for people, not things: I think it was your Dad who phoned. She's one of those people who love to be the centre of attention. He called James, who was a good friend as well as the family doctor. The other people who (also that) live in the house are really friendly. This is Gabriel, who I told you about.
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Grammar
Idioms
(Definition of who from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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