once

/wʌns/
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once

She visited the library once last week.

Definition

  1. Adverb:

    • At one time in the past; formerly: Refers to a situation that was true at an unspecified time in the past but is no longer true.
    • One single time; on one occasion: Indicates that an action happened or happens one time only.
    • At any time; ever: Used in negative or conditional contexts to mean 'at any time' or 'ever'.

  2. Conjunction:

    • As soon as; when: Used to indicate that something happens immediately after or at the moment something else happens.
Usage Examples
  • Adverb (formerly):
    • This city was once a small village.
    • I once believed in magic.
  • Adverb (one time):
    • I have been to Paris only once.
    • Call me once you arrive.
  • Adverb (ever - in negative contexts):
    • If you once start complaining, you'll never stop.
  • Conjunction (as soon as):
    • Once you understand the rules, the game becomes easy.
    • Once the rain stops, we can go outside.
Advanced Usage
  • "all at once": suddenly; all together at the same time.
    • All at once, the lights went out.
    • The audience stood up all at once.
  • "at once": immediately; simultaneously.
    • You must leave at once.
    • She can do two things at once.
  • "for once": on this (or that) single occasion, especially as an exception.
    • For once, he arrived on time.
  • "once and for all": finally and conclusively.
    • Let's settle this argument once and for all.
Variants and Related Words
  • Once-over (noun): a quick look or inspection.
    • He gave the document a quick once-over.
  • Oncer (noun, informal, chiefly British): a person who does something only once, or a thing that occurs only once.
Synonyms
  • Adverb (formerly): formerly, previously, at one time, in the past.
  • Adverb (one time): one time, a single time.
  • Conjunction: as soon as, when, after.
Related Phrases and Idioms
  • Once in a blue moon: very rarely.
    • He visits us once in a blue moon.
  • Once upon a time: used at the beginning of fairy tales to mean 'a long time ago in the past'.
    • Once upon a time, there was a beautiful princess.
  • Once bitten, twice shy: after an unpleasant experience, one is cautious in similar situations.
  • Once in a while: occasionally; sometimes but not often.
    • We go out for dinner once in a while.
once

She visited the library once last week.

Adverb
  1. at a previous time;
    • at one time he loved her
    • her erstwhile writing
    • she was a dancer once
  2. as soon as
    • once we are home, we can rest
  3. on one occasion
    • once I ran into her

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