OK1 S1 , okay
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.
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?
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?
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?