There are 2 definitions of OK in English:

OK1

Syllabification: OK
Pronunciation: /ˌōˈkā
 
/
(also okay /ˈōˈkā/) informal

exclamation

1Used to express assent, agreement, or acceptance: OK, I’ll pass on your message OK, OK, I give in
More example sentences
  • The city hits you with permit fees - okay, fine.
  • Hope to see you all - okay, not all, as there isn't a bar big enough to fit everyone, but lots of you - on the 9th.
  • I hope my labours (and, okay, those of the musicians) are enjoyed by the ne'er-do-wells.
Synonyms
all right, right, very well, very good, fine, fair enough
informal okey-doke, okey-dokey
1.1Used to introduce an utterance: “OK, let’s go.”
More example sentences
  • I thought: okay, this is the one I'll call on first.
  • Stefan came into the office, ‘Okay, and now I need everyone's opinions so I can do some work.’
  • Okay I think that your phone is broken.

adjective

[predicative] Back to top  
1Satisfactory but not exceptionally or especially good: the flight was OK
More example sentences
  • In fairness, Casey probably did an okay job of the song, but I'd fallen asleep ten seconds into it.
  • He was doing an okay job, until he missed one swing.
  • Even though the job scenario has been okay, you just know something was bound to go wrong somewhere.
Synonyms
1.1(Of a person) in a satisfactory physical or mental state: are you OK, Ben?
More example sentences
  • But only to reassure you that she is physically okay.
  • She seemed to be okay physically as far as I could tell, but she frowned when she saw me - something was up, obviously.
  • For me, it's a physical need to see to it that you're okay.
Synonyms
fine, all right, well, in good shape, in good health, fit, healthy, up to snuff
informal as fit as a fiddle, in the pink, as right as rain, hunky-dory
1.2Permissible; allowable: I’m not sure if it’s OK to say that to a teacher
More example sentences
  • I have a strong preference to avoid checking any luggage, so carry-on appropriate items are okay; things that have to be checked, not so good.
  • ‘I said any date would be okay when his schedule permits,’ Koizumi told reporters after the meeting with Primakov.
  • Most even find that it's okay to go further than that, with permission from everyone concerned of course.
Synonyms
permissible, allowable, acceptable, all right, in order, permitted, fitting, suitable, appropriate, fine
informal kosher

adverb

Back to top  
In a satisfactory manner or to a satisfactory extent: the computer continues to work OK
More example sentences
  • We've done okay this season and have tried to cover up our weaknesses as much as we can.
  • By and large it seems to be going okay and according to the returning officer we are on course and all the papers are due to go out this week.
  • Just because we did okay last year doesn't mean we cannot fail this time round.
Synonyms

noun

[in singular] Back to top  
An authorization or approval: do you know how long it takes for those pen-pushers to give us the OK?
More example sentences
  • A misconception is that if they give the okay for organ and tissue retrieval, they won't be able to have an open casket or a funeral at all.
  • They don't need an okay from the Ministry to proceed with any project.
  • The family made an application for a grant and, on April 16, 2002, they were given the okay for the work.
Synonyms
authorization, approval, (the) seal of approval, agreement, consent, assent, permission, endorsement, ratification, sanction, approbation, confirmation, (the) blessing, leave
informal (the) go-ahead, (the) green light, (the) thumbs up, (the) say-so

verb (OK's, OK'ing, OK'd)

[with object] Back to top  
Sanction or give approval to: the governor recently OK’d the execution of a man who had committed murder
More example sentences
  • If the Senate approves the exact legislation okayed by the House - down to every single word and comma - the legislation would then be sent to the President.
  • Technically this bill required no Presidential approval, and it was okayed by the Governor.
  • The plan, which recently resurfaced after being dropped, still has to be okayed by county traffic chiefs.
Synonyms
authorize, approve, agree to, consent to, sanction, pass, ratify, endorse, allow, give something the nod, rubber-stamp
informal give the go-ahead, give the green light, give the thumbs up
formal accede to

Origin

mid 19th century: probably an abbreviation of orl korrect, humorous form of all correct, popularized as a slogan during President Van Buren's re-election campaign of 1840; his nickname Old Kinderhook (derived from his birthplace) provided the initials.

Definition of OK in:

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Word of the day anastrophe
Pronunciation: əˈnastrəfi
noun
the inversion of the usual order of words...

There are 2 definitions of OK in English:

OK2

Syllabification: OK

abbreviation

Oklahoma (in official postal use).

Definition of OK in: