OK comes from 'oll korrect,' a joke misspelling of 'all correct' in an 1839 Boston newspaper, later boosted by Martin Van Buren's presidential campaign.
Satisfactory, acceptable, or in good condition.
Almost certainly from the abbreviation of 'oll korrect,' a humorous misspelling of 'all correct' that appeared in the Boston Morning Post on March 23, 1839. This was part of a broader fad in 1830s American journalism for comic abbreviations. It was then popularized as a political slogan for Martin Van Buren's 1840 presidential campaign, where 'OK' stood for 'Old Kinderhook,' his nickname.