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English definition of “OK”

OK

adjective (ACCEPTABLE) (also okay)     /ˌəʊˈkeɪ/ US  /ˌoʊ-/ informal
A1 in a satisfactory state or of a satisfactory quality: How's Paula? Is she okay after her fall yesterday? Are you OK? You look a bit pale. "Is everything OK with you?" "Yes, fine." I'll just check that the car's okay - that was a bit of a bang! → Synonym all right adjective adverbQuite good, or not very goodSuitable and acceptableSuitable and acceptableQuite good, or not very good A2 not bad but certainly not good: "Did you have a good meal last night?" "It was okay, though I've certainly had better." Her voice is OK, but it's nothing special.Quite good, or not very goodSuitable and acceptable all right adjective adverbGrammar:Okay, OKWe use okay (also spelt OK) in informal language. We use it in different ways, as a discourse marker, adjective or adverb.See moreGrammar:Okay as a discourse markerSee moreGrammar:Okay as an adjectiveWe often use okay as an adjective to say that something is not a problem, it’s ‘all right’:See moreGrammar:Okay as an adverbOkay is used as an adverb in informal speech, meaning ‘all right’, ‘neither well nor badly’:See more
(Definition of OK adjective (ACCEPTABLE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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