English

Definition of OK exclamation from the Oxford Advanced Learner's Dictionary

      

    OK

     exclamation
    (also okay) exclamation
    BrE BrE//əʊˈkeɪ//
     
    ; NAmE NAmE//ˈkeɪ//
     
    (informal)
     
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  1. 1  yes; all right ‘Shall we go for a walk?’ ‘OK.’
  2. 2  used to attract somebody’s attention or to introduce a comment Okay, let's go.
  3. 3  used to check that somebody agrees with you or understands you The meeting's at 2, OK? I'll do it my way, OK?
  4. 4  used to stop people arguing with you or criticizing you OK, so I was wrong. I'm sorry.
  5. Word Origin mid 19th cent. (originally US): probably an abbreviation of orl korrect, humorous form of all correct, popularized as a slogan during President Van Buren's re-election campaign of 1840 in the US; his nickname Old Kinderhook (derived from his birthplace) provided the initials.
See the Oxford Advanced American Dictionary entry: OK