Both are acceptable.
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DirtyGameWhich one is the most proper to use, OK or Okay?OK is the abbreviation of okay. OK is more commonly used.
Yoong LiatOK is the abbreviation of Okay. OK is more commonly used.No, I think okay came from OK, not the other way. OK is an acronym for "oll korrekt" (all correct"). I don't really know why people began using okay (it's longer), but I'm pretty sure OK came first.