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English definition of “not”

not

adverb [not gradable]    /nɑt/
used to make a word or group of words negative, or to give a word or words an opposite meaning: Her life was not happy. If it’s not yours, whose is it? He’s not bad-looking (= He is attractive). She was not only an excellent teacher but (also) a brilliant researcher (= she was both these things). Not that I mind (= I do not mind), but why didn’t you call yesterday? not-too-distant Not-too-distant refers to a time in the near future or recent past: They plan to have children in the not-too-distant future.
(Definition of not adverb from the Cambridge Academic Content Dictionary © Cambridge University Press)
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