Longman Dictionary of Contemporary English homepage

OK

1 interjection
     
OK1 S1 , okay
1 used to show that you agree with something or give permission for someone to do something:
'Can I take the car today?' 'Okay.'
OK, if that's what you prefer.
2 used to ask someone if they agree with you or will give permission for you to do something:
I'll see you at seven, OK?
3 used when you start talking about something new, or when you pause before continuing:
OK, let's move on to the next point.
Okay, any questions so far?
4 used to tell someone to stop arguing with you or criticizing you:
OK, OK, so I made a mistake.
Look, I'm doing my best, okay?
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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