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English definition of “fact”

fact

noun [C or U] uk   /fækt/ us  
A2 something that is known to have happened or to exist, especially something for which proof exists, or about which there is information: No decision will be made till we know all the facts. I don't know all the facts about the case. I'm not angry that you took my car - it's just the fact that you didn't ask me first. He knew for a fact that Natalie was lying. It's sometimes hard to separate fact from fiction. as a matter of fact B1 (also in (actual) fact) used to add emphasis to what you are saying, or to show that it is the opposite of or different from what went before: I don't work. In fact, I've never had a job. "Have you always lived here?" "As a matter of fact (= the truth is) I've only lived here for the last three years." a fact of life something unpleasant that cannot be avoided: Going bald is just a fact of life. facts and figures exact detailed information: We are getting some facts and figures together and we will then have a full board meeting. the facts of life details about sexual activity and the way that babies are born
(Definition of fact from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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