OK1
(also okay) informal
¦ exclamation
1. expressing agreement or acquiescence.
2. introducing an utterance.
¦ adjective
1. satisfactory; fairly good.
2. permissible.
¦ adverb in a satisfactory manner or to a satisfactory extent.
¦ noun an authorization or approval.
¦ verb (OK's, OK'ing, OK'd) give approval to.
Word History
The exclamation OK is first recorded in the mid 19th century. It is most probably an abbreviation of orl korrect, a humorous form of all correct, which was popularized as a slogan during US President Martin Van Buren's re-election campaign of 1840. The initials also represented his nickname Old Kinderhook, derived from his birthplace, Kinderhook in New York State.
--------
OK2
¦ abbreviation Oklahoma (in official postal use).