Synonyms|396Antonyms|89|Broader|6Narrower|5Related|200
2
lately(adverb, earlier, then, before, erstwhile)
2
never
2
of old(expression, adjective, adverb, last, original)
2
of yore(expression, adjective, adverb, last, original)
2
olden days(expression, adjective, late, old, past)
2
once only(expression, adjective, idiom, adverb, past)
2
one-time(adjective, last, late, old, past)
2
positively
2
primeval(last, original, past, primitive, venerable)
2
primitive(last, original, old, past, venerable)
2
prior(adjective, late, old, past, previous)
2
promptly
2
recent(adjective, late, old, past, previous)
2
single time(expression, adverb, then, previously, formerly)
2
together
2
without delay
1
aboriginal(last, original, past, primitive, venerable)
1
age-old(last, original, past, primitive, venerable)
1
alone
1
an
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APASmart Define. (2016). once thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/once/thesaurus/synonyms
ChicagoSmart Define. 2016. "once thesaurus" https://smartdefine.org/once/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, once thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/once/thesaurus/synonyms>.
MLASmart Define. "once thesaurus" 30 March 2016. Web. 22 September 2026. <https://smartdefine.org/once/thesaurus/synonyms>