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English definition of “what”

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what

pronoun, exclamation  /hwʌt, wʌt, hwɑt, wɑt, hwət, wət/ us  

what pronoun, exclamation (QUESTION)

used to introduce general questions: What did the teacher say? What is the capital of Nevada? As an adjective, what can refer to people or things: What time is it? I don’t know what children she was talking about. What may be used to show that you did not hear something and to ask that it be repeated: "Humphrey Jones called." "What (was that)?" "I said Humphrey Jones called."

what

pronoun  /hwʌt, wʌt, hwɑt, wɑt, hwət, wət/ us  

what pronoun (THAT WHICH)

the thing which; that which: I really didn’t know what to say. What annoyed me was her attitude. I hope you like the sweater – it’s what you asked for.

what pronoun (OPINION)

used to introduce your opinion: "She can’t come." "What a pity (= I am sorry to hear that)!"
(Definition of what from the Cambridge Academic Content Dictionary © Cambridge University Press)
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