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English definition of “really”

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really

adverb uk   /ˈrɪə.li/ us    /ˈriː.ə-/

really adverb (NOT IMAGINARY)

B1 in fact: He isn't really angry - he's just pretending. You don't really expect them to refuse, do you?A2 used to say that something is certain: Thank you, but I really couldn't eat another thing. He's really going to do it this time.
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really adverb (VERY)

A1 very or very much: She's really nice. This room is really hot. That's really interesting. It's a really difficult decision. "Did you like it? Not really (= no)."
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really

exclamation uk   /ˈrɪə.li/ us    /ˈriː.ə-/
A2 used to express interest, surprise, or anger: "I'm getting married to Fred." "Really? When?" "She's agreed to do a parachute jump for charity." "Really? Do you think she'll do it?" "He hasn't brought the book back." "Oh, really! That's the second time I've asked him!"
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(Definition of really from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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