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once

Synonyms of once in English:

adverb

  • 1 I saw him only once
    on one occasion, one time, one single time
    [Antonyms] twice, many times
  • 2 he did not once help
    ever, at any time, on any occasion, at all, under any circumstances, on any account, in a million years
  • 3 they were friends once
    formerly, previously, in the past, at one time, at one point, once upon a time, on a former occasion, on one occasion, one time, in one case, time was when, in days/times gone by, back in the day, in times past, in the (good) old days, long ago
    archaic sometime, erst, erstwhile, whilom
    literary in days/times of yore, of yore
    [Antonyms] now
  • Phrases

    at once

    1
  • 1 you must leave at once
    immediately, right away, right now, this moment/instant/second/minute, now, straight away, instantly, instantaneously, directly, suddenly, abruptly, summarily, forthwith, promptly, without delay/hesitation, without further ado;
    quickly, as fast as possible, as soon as possible, fast, speedily, with all speed
    informal like a shot, in/like a flash, before you can say Jack Robinson, in two shakes (of a lamb's tail)
    [Antonyms] later, in due course
  • 2 all the guests arrived at once
    at the same time, at one and the same time, at the same instant/moment, (all) together, simultaneously;
    as a group, in unison, in concert, in chorus
    [Antonyms] singly, in dribs and drabs
  • conjunction

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  • he'll be all right once she's gone
    as soon as, when, after, immediately after, the instant/moment/second/minute
    British informal immediately
  • Phrases

    once and for all

    1
  • 1 you must decide once and for all
    conclusively, decisively, finally, positively, absolutely, determinedly, definitely, definitively, irrevocably
  • 2 he has gone once and for all
    for good, for always, forever, permanently, finally, in perpetuity
    informal for keeps
  • once in a while

    2
    once in a while a car went past
    rare interruptedly

    Definition of once in:

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