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English definition of “OK”

OK

exclamation, adjective [not gradable] (also okay)  /ˈoʊˈkeɪ, ˌoʊˈkeɪ, ˈoʊˌkeɪ/ us  

OK exclamation, adjective [not gradable] (AGREED)

agreed or acceptable; all right : Is it OK if I bring a friend to the party? "Will you lend me ten bucks?" "OK."
OK
verb [T] (singular OK's, present participle OK'ing or okaying, past tense and past participle OK'd or okayed) (also okay)  /ˈoʊˈkeɪ, ˌoʊˈkeɪ, ˈoʊˌkeɪ/ us  
Did the boss OK your proposal?

OK

adjective, adverb (also okay)  /ˈoʊˈkeɪ, ˌoʊˈkeɪ, ˈoʊˌkeɪ/ us  

OK adjective, adverb (SATISFACTORY)

in a satisfactory state or of a satisfactory quality; all right : Are you OK? You look pale. I hope you got home OK. OK is used to mean not bad but also not very good: Her voice is OK, but it’s nothing special.

OK

noun [C] (also okay)  /ˈoʊˈkeɪ, ˌoʊˈkeɪ, ˈoʊˌkeɪ/ us  

OK noun [C] (AGREED)

agreement about or permission to do something: We’ll start building as soon as we get the OK from the owner.
(Definition of OK exclamation, adjective, adjective, adverb, noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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