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English definition of “OK”

OK

exclamation (AGREEING) (also okay)     /ˌəʊˈkeɪ/ US  /ˌoʊ-/
A1 used to show that you agree with something or agree to do something: "I'll pay you back tomorrow ." "OK, no problem ." "Could you pick me up from the station ?" "OK, what time ?" I mean , OK (= I accept that), I wasn't exactly polite to him, but I don't think I was that rude !Words and phrases expressing agreement and acceptance Grammar:Okay, OKWe use okay (also spelt OK) in informal language. We use it in different ways, as a discourse marker, adjective or adverb.Grammar:Okay as a discourse markerGrammar:Okay as an adjectiveWe often use okay as an adjective to say that something is not a problem, it’s ‘all right’:Grammar:Okay as an adverbOkay is used as an adverb in informal speech, meaning ‘all right’, ‘neither well nor badly’:
(Definition of OK exclamation (AGREEING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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