definition of
OK

[1] #1 OK r. [very well, fine, alright, all right] an expression of agreement normally occurring at the beginning of a sentence. wn

[2] #2 OK n. [Oklahoma, Sooner State] a state in south central United States. wn

[3] #3 OK s. [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 b. wn

[4] #4 OK n. [O.K., okay, okey, okeh] an endorsement; "they gave us the O.K. to go ahead". wn