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English definition of “really”

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really

adverb [not gradable]  /ˈri·ə·li, ˈri·li/ us  

really adverb [not gradable] (SINCERELY)

sincerely; truly: I’m really telling the truth this time. If she really cared about me, she would have called by now.

really adverb [not gradable] (VERY GREAT)

extremely: That was a really good movie. This room is really hot.

really adverb [not gradable] (ACTUALLY)

actually: What really happened that day? I just don’t know if we would really use it that much.

really

exclamation  /ˈri·ə·li, ˈri·li/ us  

really exclamation (EXPRESSING SURPRISE)

used to express interest, surprise, or annoyance: "Debbie and I are getting married." "Really? When?" Really, Jen, you should have let me know sooner.
(Definition of really from the Cambridge Academic Content Dictionary © Cambridge University Press)
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