fact Meaning in the Cambridge English Dictionary
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Meaning of “fact” in the English Dictionary

"fact" in British English

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factnoun [C or U]

uk   us   /fækt/
A2 something that is ​known to have ​happened or to ​exist, ​especially something for which ​proofexists, or about which there is ​information: No ​decision will be made until 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 ​addemphasis 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 exactdetailedinformation: We are getting some facts and ​figures together and we will then have a ​fullboardmeeting.the facts of life details about ​sexualactivity and the way that ​babies are ​born
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(Definition of fact from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"fact" in American English

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factnoun [C]

 us   /fækt/
something ​known to have ​happened or to ​exist: No one ​disputes the fact that the ​accident could have been ​avoided.
(Definition of fact from the Cambridge Academic Content Dictionary © Cambridge University Press)
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