OK Definition in Cambridge British English Dictionary
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Definition of "OK" - British English Dictionary

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OKexclamation

(also okay) uk   /ˌəʊˈkeɪ/  us   /ˌoʊ-/

OK exclamation (AGREEING)

A1 used to show that you agree with something or agree to do something: "I'll pay you back tomorrow." "OK, no problem." "Could you pick me up from the station?" "OK, what time?" I mean, OK (= I accept that), I wasn't exactly polite to him, but I don't think I was that rude!

OK exclamation (UNDERSTAND)

A2 used to check that someone understands something or that they agree to something: You need to add a bit more vinegar, OK? I'll see you at 6.30, okay?

OK exclamation (ACTION)

A2 informal used as a way of showing that you are going to take action or start something new: Okay, let's go. Okay then, if you're ready we'll start.
More examples
  • Okay, let's get going!
  • OK, is everyone ready?
  • Okay, today I'm going to tell you a bit about Picasso.
  • OK, now that everyone's here, we'll sit down.
  • OK, Stephanie, could you tell us what you've been doing this week?

OK exclamation (PAUSE)

not standard used in the middle of a sentence as a way of pausing: We saw these guys, okay, so we went up to them and started talking.

OKadjective

(also okay) uk   /ˌəʊˈkeɪ/  us   /ˌoʊ-/ informal

OK adjective (AGREED)

A2 agreed or acceptable: Is it okay if I bring a friend to the party? If it's okay by/with you, I'll leave the shopping till tomorrow.
More examples

OK adjective (ACCEPTABLE)

A1 in a satisfactory state or of a satisfactory quality: How's Paula? Is she okay after her fall yesterday? Are you OK? You look a bit pale. "Is everything OK with you?" "Yes, fine." I'll just check that the car's okay - that was a bit of a bang!
Synonym
A2 not bad but certainly not good: "Did you have a good meal last night?" "It was okay, though I've certainly had better." Her voice is OK, but it's nothing special.
More examples

OKadverb

(also okay) uk   /ˌəʊˈkeɪ/  us   /ˌoʊ-/ informal

OKverb [T]

(present tense OK's, present participle OK'ing, past tense and past participle OK'd) (also okay (present tense okays, present participle okaying, past tense and past participle okayed)) uk   /ˌəʊˈkeɪ/  us   /ˌoʊ-/ informal
to agree to something: Have the committee OK'd your proposal?

OKnoun

uk   /ˌəʊˈkeɪ/  us   /ˌoʊ-/

OK noun (PERMISSION)

the OK (also the okay) [S] permission: He's got the OK to go ahead with his project.

OK noun (ADDRESS)

written abbreviation for the US state of Oklahoma: used in addresses
(Definition of OK from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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