Synonyms for Once:

• adj.

  •erstwhile (adjective)
  • more sometime,
  • exest,
  • pre-ceding,
  • by-gone,
  • pre ceding,
  • by gone,
  • most sometime.
  •former (adjective)
  • more above,
  • fore-going,
  • more ex-,
  • most whilom,
  • most aforementioned,
  • most ex-,
  • most ex,
  • de parted,
  • more whilom,
  • de-parted,
  • fore going,
  • more ex,
  • more aforementioned,
  • most above.
  •late (adjective)
  • exanimate,
  • latest.
  •old (adjective)
  • primeval,
  • ageold,
  • time-worn,
  • oldfangled,
  • wornout,
  • castoff,
  • old fashioned,
  • olden,
  • cast-off,
  • oldfashioned,
  • out of date.
  •olden (adjective)
  • old as hills,
  • old as the hills.
  •Other relevant words: (adjective)
  • erstwhile,
  • aforementioned,
  • old,
  • long gone,
  • EXER,
  • ex-,
  • of yore,
  • earlier,
  • past,
  • one time,
  • Whilom,
  • former,
  • ex,
  • long ago.
  •past (adjective)
  • way back when,
  • ages ago,
  • way back,
  • gone by,
  • Latterday,
  • long-ago,
  • behind one,
  • gone-by,
  • good old days.

• adv

  •anyway (adverb)
  • at any rate,
  • in any case,
  • in any manner,
  • at all,
  • in any event.
  •Other relevant words: (adverb)
  • hitherto,
  • previously,
  • Beforetime,
  • formerly,
  • sometime,
  • one shot,
  • by that time,
  • antecedently,
  • up to now,
  • even now,
  • some time ago,
  • at present,
  • just now,
  • already,
  • in olden days,
  • by this time,
  • Aforetime,
  • in the olden days,
  • by now,
  • back when,
  • of old,
  • before now,
  • at one time,
  • once upon a time,
  • as of now,
  • in advance,
  • down memory lane,
  • in anticipation,
  • before this,
  • until now,
  • in the past,
  • one-shot,
  • used to be,
  • but now,
  • eons ago,
  • by then,
  • Erewhile,
  • by the time mentioned.

• adv.

  •all (adverb)
  • once.
  •already (adverb)
  • as now,
  • by time mentioned,
  • by time,
  • up now,
  • then,
  • in past.
  •anyway (adverb)
  • however,
  • ever.
  •beforetime (adverb)
  • be-foretime,
  • be foretime.
  •formerly (adverb)
  • in former times,
  • once up on time,
  • used be,
  • time was,
  • olden days,
  • once up on a time,
  • a while back,
  • once upon time,
  • at time,
  • water under bridge.
  •in the past; occurred one time only (adverb)
  • a single time,
  • in the old days,
  • in times past,
  • away back,
  • one time previously,
  • this time,
  • only one time,
  • heretofore,
  • on one occasion,
  • one,
  • quondam,
  • in times gone by,
  • but once,
  • one time before.
  •previously (adverb)
  • in days gone by,
  • be forehand,
  • a while ago,
  • oneshot,
  • Precedently,
  • be-forehand.

• n.

  •
  • beyond,
  • subsequently,
  • Since,
  • ensuing,
  • in time,
  • subsequent,
  • after,
  • succeeding,
  • following,
  • in the course of time.
  •
  • one day,
  • once only,
  • uniquely.
  •
  • once in a lifetime,
  • in/at one fell swoop,
  • precede.
  •erst (noun)
  • erst.
  •in one case (noun)
  • in one case.
  •one time (noun)
  • twice.
  •onetime (noun)
  • onetime.
  •Other relevant words: (noun)
  • frequency.
  •when (noun)
  • when.

• Other synonyms:

  •
  • bygone,
  • immemorial,
  • ago.
  •
  • unrepeatable,
  • one-off,
  • backward.
  •
  • isolated.
  •
  • previous,
  • late.
  •
  • back.
  •alone
  • singly.
  •Other relevant words:
  • in other words,
  • no longer,
  • before.

Paraphrases for Once:

• Independent

  • Preposition or subordinating conjunction
    before, then, If, Since, Until, requests.
  • Proper noun, singular
    when.
  • Adverb
    already, before, concurrently, even, eventually, ever, finally, immediately, just, now, only, previously, simultaneously, someday, sometime, sometimes, soon, sooner, still, subsequently, then, thereafter, therefore, twice, yet, Definitively, Since.

Antonyms for Once:

• adj.

  • Other antonyms:
    contemporary, present, ongoing, current, extant, unborn, present-day, prospective, coming.

• adv.

  • in the past; occurred one time only
    later, presently, future, currently.