Meaning of ok

(adj) 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"

(adv) an expression of agreement normally occurring at the beginning of a sentence

(noun) a state in south central United States

an endorsement; "they gave us the O.K. to go ahead"