1. (noun) Oklahoma, Sooner State, OK
a state in south central United States
2. (adj) O.K., OK, okay, okey, okeh
an endorsement
"they gave us the O.K. to go ahead"
3. (adverb) all right, fine, o.k., ok, okay, hunky-dory
being satisfactory or in satisfactory condition
"an all-right movie"; "the passengers were shaken up but are all right"; "is everything all right?"; "everything's fine"; "things are okay"; "dinner and the movies had been fine"; "another minute I'd have been fine"
4. (adverb) very well, fine, alright, all right, OK
an expression of agreement normally occurring at the beginning of a sentence
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Definition of 'ok' 
