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English definition of “really”

really

exclamation     /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!"InterjectionsSounds used as interjections Grammar:ReallyWe use the adverb really when we want to emphasise something:
(Definition of really exclamation from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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