Source : WordNet®

O.K.
     n : an endorsement; "they gave us the O.K. to go ahead" [syn: {OK},
          {okay}, {okey}, {okeh}]

O.K.
     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') [syn: {okay}, {all
           right}, {alright}]

O.K.
     v : give sanction to; "I approve of his educational policies"
         [syn: {approve}, {okay}, {sanction}] [ant: {disapprove}]