OK

Etymology

Its exact origin is debated, but the most widely accepted story traces it to a 1839 Boston newspaper fad for joke misspellings — "oll korrect" for "all correct" — abbreviated to OK, which then got a huge popularity boost from Martin Van Buren's 1840 presidential campaign (his nickname was "Old Kinderhook").

· First attested 1839

Class of 1839

OK first entered the language around 1839.