o.k. :
O.K.
okay
[interjection]
Synonyms:
- all right, agreed, right, roger, very good, very well, yes
[adjective]
Synonyms:
- all right, acceptable, adequate, fine, good, in order, permitted, satisfactory, up to scratch (informal)
[verb]
Synonyms:
- approve, agree to, authorize, endorse, give the green light, rubber-stamp (informal), sanction
[noun]
Synonyms:
- approval, agreement, assent, authorization, consent, go-ahead (informal), green light, permission, sanction, say-so (informal), seal of approval

[TahlilGaran] English Synonym Dictionary ▲

I. OK¹ S1 , okay /ˌəʊ ˈkeɪ $ ˌoʊ-/ interjection

1. 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.

2. 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?

3. 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?

4. 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?

[TahlilGaran] Dictionary of Contemporary English ▲

II. OK² S1 , okay adjective, adverb spoken

1. [not before noun] if you are OK, you are not ill, injured, or unhappy Synonym : all right:
Are you OK?
Do you feel OK now?
Mum’s doing OK now.

2. [not before noun] something that is OK is acceptable and will not cause any problems Synonym : all right:
Will half past eight be OK?
Does my hair look OK?
that’s/it’s OK
‘Sorry I’m late.’ ‘That’s OK.’
Is it OK if I leave my bags here?
Yeah, the TV's working OK.
it is okay (for somebody) to do something
It’s okay for you to go home now.
it is okay with/by somebody
I’ll pay you the rest tomorrow, if that’s OK with you.

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People usually avoid OK or okay in writing, and use more formal words such as acceptable or satisfactory:
We have to make sure that the quality is acceptable.

3. [not before noun] satisfactory but not extremely good:
‘How was the film?’ ‘It was okay, but not brilliant.’
I think I did okay in the exam.

4. someone who is OK is nice, pleasant etc:
I’ve met Jim once, and he seems OK.
He’s an OK guy.

[TahlilGaran] Dictionary of Contemporary English ▲

III. OK³ , okay verb (past tense and past participle OK’d, present participle OK'ing, third person singular OK’s or okayed, okaying, okays) [transitive] informal
to say officially that you will agree to something or allow it to happen:
The plans have been okayed, so let’s get started as soon as possible.

[TahlilGaran] Dictionary of Contemporary English ▲

IV. OK⁴ , okay noun
give (somebody) the OK/get the OK informal to give or get permission to do something:
Did you get the OK from head office?

[TahlilGaran] Dictionary of Contemporary English ▲

V. O‧kla‧ho‧ma /ˌəʊkləˈhəʊmə◂/ written abbreviation, OK
a state in the Great Plains in western central US, whose products include oil and grain. Oklahoma has a large Native American population. Its farmlands became part of the Dust Bowl in the 1930s, when very dry conditions forced many people to leave their farms and look for work in other places, especially California.

[TahlilGaran] Dictionary of Contemporary English ▲

OK! /əʊ ˈkeɪ/ trademark
a British magazine which publishes pictures and articles about famous people

[TahlilGaran] Dictionary of Contemporary English ▲

ok
(also
okay) adj., adv.
VERBS be, feel, look, seem, smell, sound, taste | do, go I think I did OK in the exam. I hope the meeting goes OK.
ADV. perfectly, quite I'm quite OK now, thanks.
PREP. ~ by sb John has suggested meeting at six, and that's OK by me.
~ with sb Is it OK with you if I come about six?

[TahlilGaran] Collocations Dictionary ▲

OK
Okay 
Oklahoma 
Ola Kala (Greek: Everything's fine; an origin for the word Okay) 
Old Kinderhook (a nickname for Martin Van Buren)

[TahlilGaran] Acronyms and Abbreviations Dictionary ▲