Definition of “who” - English Dictionary

“who” in British English

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whopronoun

us uk /huː/

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

Idiom(s)

the WHOnoun [ + sing/pl verb ]

uk /ˌdʌb.əl.juː.eɪtʃˈəʊ/ us /ˌdʌb.əl.juː.eɪtʃˈoʊ/

abbreviation for the World Health Organization

(Definition of “who” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“who” in American English

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whopronoun

us /hu/

who pronoun (ASKING)

used esp. in questions to ask which person or people, or to ask someone’s name:

Who did this?
Who’s she?
Note: In formal speech or writing, "whom" is the form of "who" used when it is the object of a verb or preposition.

who pronoun (ADDING INFORMATION)

used as the subject or object of a verb when referring to a particular person or when adding information about a person just mentioned:

The other people who live in the house are really friendly.
This is Frank, who I told you about.
Note: In formal speech or writing, "whom" is the form of "who" used when it is the object of a verb or preposition.

(Definition of “who” from the Cambridge Academic Content Dictionary © Cambridge University Press)