Quote:
Originally Posted by Daniel A Roberts
It surprises me sometimes that folks truly don't know where the acronym OK comes from, and how it came to be used. Yes, it goes back to the 1800's.
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It surprises me how you can pick one source out of many and call that authoritative when there are disagreeing sources with equal validity.

We do not know for sure where it came from and several well supported options were presented in this thread.