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English definition of “OK”

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OK

exclamation ( also okay)  /ˈoʊˈkeɪ, ˌoʊˈkeɪ, ˈoʊˌkeɪ/ infml us  

OK exclamation (EXPRESSION)

used as a way of showing that you are going to take action or start doing or saying something new: OK, let’s go.
(Definition of OK exclamation from the Cambridge Academic Content Dictionary © Cambridge University Press)
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