OK

PRONUNCIATION; (o-KAY, O-kay)

MEANING:adjective: 1. Satisfactory; not very good or very bad.
2. Correct.
3. Mediocre.
4. In good health.
noun: Approval or permission.
verb: To authorize or approve.
adverb: In a satisfactory manner.
interjection: Used to express acknowledgment or agreement.

ETYMOLOGY:
In the 1830s, in Boston, there was a fad of making abbreviations; also of using jocular misspellings. So “all correct” became of “oll korrect” which became abbreviated to OK.
The word would have ended as a fad, but along came US President Martin Van Buren (1782-1862). During his re-election campaign of 1840, his supporters adopted the word OK as a nickname for him (short for Old Kinderhook; he was born in Kinderhook, New York) and the word has lived on ever since, not only in the English language, but most of the languages around the world. Earliest documented use: 1839.

NOTES:
It’s OK. It’s an all-American word. And like many things made in America, it’s used everywhere. Not bad for a two-letter word. It can work as an adjective, noun, verb, adverb, interjection, and probably anything else that your imagination can conjure. It’s not often that a whole book is written about a single word. Check out OK: the Improbable Story Of America’s Greatest Word.
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OCK - what a Cockney goes into when he's short of cash

AK - half of an anti-aircraft barrage

OKA - a goose, whose eggs were made into a musical instrument when dried out and emptied and perforated just so...thousands of years ago.