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once

WUNS/wʌn(t)s/

6 meanings of once

Practice

  1. 1
    a single timeadverb
    On a single occasion; one time and no more.

    The festival happens only once a year, so we never miss it.

    She read the letter once and then tore it into pieces.

    UsageOften only once or once a year. Note that at once means immediately or at the same time.

  2. 2
    as soon asconjunction
    From the moment that; as soon as; after a stated event has taken place.

    Once the contract is signed, the work can begin immediately.

    The engine runs smoothly once it has warmed up.

    UsagePresent tense for the future: once you get home (not incorrect: once you will get home); once you have finished for a completed step.

    Similarwhen, after

  3. 3
    in the pastadverb
    At some time in the past; formerly, with the sense that it is no longer so.

    The quiet street was once the busiest market in the city.

    He was once a celebrated tenor, though few now remember him.

    UsageUsually before the main verb, but after be: once lived by the sea, was once a school.

    Similarformerly, previously

    Oppositenow

    Note

    The sense that looks back across a change: he was once handsome, the area once covered with ice. At the head of a sentence it can be mistaken for the conjunction 'as soon as'. Once I didn't drive a big car is a complete statement about the past, while the conjunction opens a clause that still needs a main clause after it.

Less common meanings

  1. 4
    ever (with if)adverb
    At any time; ever, used within a conditional or hypothetical clause to mark indefinite time.

    Should the enemy once suspect a trap, the whole plan would collapse.

    He warned that if the rumor once took hold, no denial could stop it.

  2. 5
    adverbobsolete
    At some time in the future; one day, someday, pointing to an anticipated but unfixed moment.
    Note

    English has let go of this forward-looking use. A modern reader meeting they would come home once hears the counting sense, or simply an unfinished sentence. In older texts, read it as 'one day'. In your own writing, say someday or one day.

    Checked 31 Oct 2026 · 1 fact

  3. 6
    adverbdated
    Multiplied by one; taken a single time over, as a number is read in a multiplication table.

Practice

Can you tell the meanings of once apart? Answer 3 quick questions from this page, or write your own sentence and AI will check it.

Origin

From Middle English ones, from Old English ānes, a reshaping (after ān, "one") of ǣnes, itself formed from ǣne ("once") with the genitive suffix -es. It is related to Old Saxon ēnes, Old High German eines/einēst, and modern German einst, all meaning "once".

Checked 31 Oct 2026 · 6 facts