Synonyms of once in English:

once

adverb

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

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

    at once

  • 1.1 you must leave at once
    immediately, right away, right now, this instant, this second, this minute, this moment, now, straightaway, instantly, directly, forthwith, promptly, without delay, without hesitation, without further ado;
    quickly, as fast as possible, as soon as possible, speedily
    informal like a shot, in a flash, pronto, ASAP, in two shakes (of a lamb's tail)
  • 2.1 all the guests arrived at once
    at the same time, at one and the same time, (all) together, simultaneously;
    as a group, in unison, in concert, in chorus
  • once and for all

    I've made up my mind, once and for all
    conclusively, decisively, finally, positively, definitely, definitively, absolutely, irrevocably;
    for good, for always, forever, permanently
    informal for keeps

    once in a while

    we go hiking once in a while
    occasionally, from time to time, (every) now and then/again, every so often, on occasion, at times, sometimes, off and on, at intervals, periodically, sporadically, intermittently

    Definition of once in:

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