Okay (also spelled as OK, O.K., ok) is one of the most commonly used words in English with multiple meanings and usages.
Main meanings of okay:
1. Used to express agreement or acceptance: "Okay, I'll do it."
2. Used to check understanding or get attention: "Okay, are you ready?"
3. Used to indicate that something is satisfactory or acceptable: "The food was just okay."
4. Used as a noun meaning approval: "I need your okay on this."
5. Used as a verb meaning to approve: "The boss okayed the proposal."