OK (/ ˌoʊˈkeɪ / ⓘ), with spelling variations including okay, O.K. and many others, is an English word (originating in American English) denoting approval, acceptance, agreement, assent, …

The meaning of OK is all right. How to use OK in a sentence.

OK definition: Satisfactory or agreeable; acceptable.

OK meaning: 1. used to show that you agree with something or agree to do something: 2. used to check that…. Learn more.

Okay, OK, and O.K. are all the same words and can be used interchangeably with one another in both informal and formal writing scenarios. In fact, OK is the original preferred spelling of the word, with …

Jul 23, 2025 · During the 1960s, NASA astronauts popularized the phrase "A-OK" to signal that all systems were go. And 56 years ago this week, "OK" was among the first words spoken from Earth to …

If something's ok, it's not terrible, but it's not wonderful either — it's simply ok. You can use this informal word to ask if something's acceptable: "Hey, is it ok if I borrow your car?"