Which came first OK or okay?

Related questions

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4. Who invented the word word?
5. Where did the term Okie Dokie come from?
6. What is the difference between okay and Okey?
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Tags

1. #began
2. #exact
3. #century
4. #derives
5. #theory
6. #correct
7. #people
8. #korrect
9. #genesis
10. #laugh
11. #contends
12. #shortened
13. #popular
14. #nineteenth
15. #unclear
16. #initials
17. #later
18. #phonetically
19. #spelling
20. #actually