Definitions
1.interjectionUsed to indicate acknowledgement or acceptance."I promise to give it back. – OK."
2.interjectionUsed to introduce a sentence in order to draw attention to the importance of what is being said."OK, I'm thinking of a number…"
3.interjectionUsed in turn-taking, serving as a request to the speaker to grant the turn to the interrupter."You always do this to me! When we were at your mother’s, you said that… – OK, OK, …"
4.nounA small, low island largely made of sand or coral.
5.nounThe name of the Latin-script letter K.
6.nounA kilometer.
7.nounA thousand of some unit (from kilo-).