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

 

OK

 noun
(also okay)noun
BrE BrE//əʊˈkeɪ//
 
; NAmE NAmE//ˈkeɪ//
 
 
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[singular] (informal) permission synonym go-ahead I'm still waiting for the boss to give me the OK. 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.Extra examples Mum’s given me the OK to go out. The building plans finally got the OK. I’m still waiting for them to give me the OK. We have to wait until we get the OK.
See the Oxford Advanced American Dictionary entry: OK