名詞 o.k.:

1. an endorsement
   同義詞：OK, okay, okey, okeh
2. a state in south central United States
   同義詞：Oklahoma, Sooner State, OK

動詞 o.k.:

1. give sanction to
   同義詞：approve, okay, sanction

形容詞 o.k.:

1. being satisfactory or in satisfactory condition
   同義詞：all right, fine, ok, okay, hunky-dory

副詞 o.k.:

1. in a satisfactory or adequate manner; (`alright' is a nonstandard variant of `all right')
   同義詞：okay, all right, alright
2. an expression of agreement normally occurring at the beginning of a sentence
   同義詞：very well, fine, alright, all right, OK