Definition of OK noun from the Oxford Advanced American Dictionary

     

    OK

     noun
    (also okay)noun
    NAmE//ˌoʊˈkeɪ//
     
    [singular](informal)
     
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  1. 1permission synonym go-ahead
  2. 2 I'm still waiting for the boss to give me the OK.
See the Oxford Advanced Learner's Dictionary entry: OK