Definition

1. Adjective:

   • Satisfactory, acceptable, or adequate: Used to indicate that something is acceptable, permissible, or in a satisfactory state.
   • In good health or order: Used to indicate that a person or thing is well, safe, or functioning correctly.

2. Adverb:

   • In a satisfactory manner or to a satisfactory degree: Used to indicate that something is done well enough or acceptably.
   • Used to express agreement or assent: Functions as a discourse marker to show acceptance, approval, or acknowledgment.

3. Noun:

   • Approval, authorization, or endorsement: An official or informal permission to proceed with something.
   • A state of the United States: Oklahoma (a proper noun, often abbreviated).

Usage Examples

• Adjective:

  • Is it OK if I open the window? (Seeking permission)
  • The car's brakes feel OK now. (Indicating satisfactory condition)
  • Are you feeling OK? (Inquiring about well-being)

• Adverb:

  • She did OK on her exam. (Indicating acceptable performance)
  • "Can you help me?" – "OK." (Expressing agreement)

• Noun:

  • We need the manager's OK before we launch. (Referring to formal approval)
  • He was born in OK. (Referring to the state of Oklahoma)

Advanced Usage

• "It's OK": A common phrase used to express that something is acceptable, to forgive someone, or to decline an offer politely.

  • "I'm sorry I'm late." – "It's OK." (Forgiveness)
  • "Would you like more coffee?" – "No, I'm OK, thanks." (Polite refusal)

• "OK, then" / "OK, so...": Used to transition to a new topic, conclude a discussion, or introduce a summary.

  • OK, so let's begin the meeting. (Introducing a topic)
  • OK, then, I'll see you tomorrow. (Concluding a conversation)

Variants and Related Words

• Okay: The most common full spelling variant, interchangeable in all uses (adjective, adverb, noun, verb).
• O.K.: A common punctuated variant.
• Okey-dokey (Informal): A playful, emphatic variant expressing agreement.

Synonyms

• Adjective/Adverb: Acceptable, fine, all right, satisfactory, adequate.
• Noun: Approval, consent, authorization, go-ahead, green light.
• Interjection (for agreement): Yes, sure, alright, agreed, roger.

Related Phrasal Verbs/Constructions

• To give the OK / To get the OK: To grant or receive permission.

  • The committee gave the OK to the new project.
  • We can start once we get the OK from headquarters.

• To be OK with something: To find something acceptable or agreeable.

  • Are you OK with the proposed changes?

Related Idioms

• A-OK: Meaning perfectly fine or excellent, often used in informal contexts.

  • After the check-up, the doctor said everything was A-OK.

• It'll be OK / Everything's going to be OK: A reassuring phrase used to comfort someone.

  • Don't worry about the mistake; it'll be OK.

Adjective

1. being satisfactory or in satisfactory condition
   • an all-right movie
   • the passengers were shaken up but are all right
   • is everything all right?
   • everything's fine
   • things are okay
   • dinner and the movies had been fine
   • another minute I'd have been fine

Adverb

1. an expression of agreement normally occurring at the beginning of a sentence

Noun

1. an endorsement
   • they gave us the O.K. to go ahead
2. a state in south central United States