Synonyms for On occasion:

• adj.

  •Other relevant words: (adjective)
  • occasionally.

• adv

  •at times (adverb)
  • intermittently.
  •every now and then (adverb)
  • ever and again,
  • sometimes.
  •infrequently (adverb)
  • uncommonly.
  •now and then (adverb)
  • once again,
  • once in blue moon,
  • now then.
  •Other relevant words: (adverb)
  • recurrently,
  • off and on,
  • at random,
  • scarcely ever,
  • in few instances,
  • hardly ever,
  • on and off,
  • ever and anon,
  • alternately,
  • here and there,
  • discontinuously.

• adv.

  •ever and again (adverb)
  • evermore.
  •intermittently (adverb)
  • betimes,
  • again.
  •now and then (adverb)
  • hardly,
  • once or twice,
  • once in a while,
  • not often,
  • once in a blue moon.
  •off and on (adverb)
  • vacillating,
  • fluctuating.
  •once (adverb)
  • previously,
  • but once,
  • one,
  • quondam,
  • once upon a time,
  • formerly,
  • back when,
  • sometime,
  • long ago,
  • a single time,
  • old,
  • away back,
  • in times gone by,
  • only one time,
  • earlier,
  • bygone,
  • in times past,
  • heretofore,
  • late,
  • one time before,
  • on one occasion,
  • this time,
  • already,
  • in the old days,
  • Whilom,
  • at one time,
  • once only,
  • one time previously,
  • before,
  • in the olden days,
  • time was,
  • erstwhile,
  • back.
  •once in a while (adverb)
  • rarely.
  •Other relevant words: (adverb)
  • ever anon,
  • variably.
  •sometimes (adverb)
  • consistently,
  • frequently,
  • constantly.
  •then (adverb)
  • ANON,
  • soon after,
  • next,
  • at that point,
  • later,
  • at that instant,
  • years ago,
  • suddenly,
  • when,
  • all at once,
  • at that moment,
  • thereupon,
  • at that time,
  • on that occasion,
  • before long.
  •uncommonly (adverb)
  • unusually,
  • extremely,
  • very,
  • exceptionally,
  • peculiarly,
  • particularly,
  • remarkably,
  • strangely,
  • oddly,
  • extra.

• n.

  •at times (noun)
  • at times.
  •from time to time (noun)
  • from time to time.
  •now and again (noun)
  • now and again.
  •now and then (noun)
  • now and then.

• Other synonyms:

  •Other relevant words:
  • occasion.
  •Other relevant words (noun):
  • time,
  • every once in a while,
  • irregularly,
  • Semioccasionally,
  • infrequently,
  • at various times,
  • at intervals,
  • periodically,
  • sporadically,
  • every now and then,
  • on divers occasions,
  • seldom,
  • once and again,
  • betweentimes,
  • every so often.

Antonyms for On occasion:

• adv.

  • occasionally
    always, steadily, regularly, frequently, usually, constantly.
  • once
    presently, future, later, currently.
  • sometimes
    never.
  • then
    earlier.
  • uncommonly
    normally, commonly.