Meaning of O.K.

(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) in a satisfactory or adequate manner; "she'll do okay on her own"; "held up all right under pressure"; (`alright' is a nonstandard variant of `all right')

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

(verb) give sanction to; "I approve of his educational policies"