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OK

exclamation (ACTION) (also okay)
 
 
/ˌəʊˈkeɪ/ US  /ˌoʊ-/ informal

Definition

A2 used as a way of showing that you are going to take action or start something new: Okay, let's go. Okay then, if you're ready we'll start.Connecting words joining words or phrases with similar or related meanings
(Definition of OK exclamation (ACTION) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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