OK

adjective, adverb, interjection, noun, Proper noun

adjective “OK”

1. allowed or not causing any problems
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   Is it OK if I borrow your pen for a moment?
2. not bad but not excellent either
   The movie was OK, but I wouldn't watch it again.
3. (followed by "with") willing to accept
   I asked if she was OK with pizza for dinner, and she said yes.
4. feeling physically or emotionally fine
   She was upset this morning, but she's OK now after talking to her friend.

adverb “OK”

1. in a way that is not bad or fairly well
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   She cooked the meal OK, even though it was her first time trying the recipe.

interjection “OK”

1. a word used to agree or confirm something
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   Can you pass me the salt? – Okay.
2. a word used in computers to close a message or agree to something
   After reading the warning message, she clicked "OK" to proceed with the software installation.
3. a word used to grab attention before saying something important
   OK, I'm doing it.

noun “OK”

1. agreement or permission to do something
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   Once the boss gives his OK, we can launch the new website.

Proper noun “OK”

1. the abbreviation for the state of Oklahoma in the USA
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   My cousin moved to Tulsa, OK, last year.