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  • out of date.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.
  •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.

• 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.
  •when (noun)
  • when.

• Other synonyms:

  •
  • bygone,
  • immemorial,
  • ago.
  •
  • unrepeatable,
  • one-off,
  • backward.
  •
  • isolated.
  •
  • previous,
  • late.
  •
  • back.
  •alone
  • singly.

Paraphrases for Once:

• Independent

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

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.