| ancient history(expression, adjective, late, old, past) | |
| anciently(adverb, earlier, then, before, erstwhile) | |
| ante | |
| antediluvian(last, original, past, primitive, venerable) | |
| antiquated(adjective, last, original, past, venerable) | |
| antique(adjective, last, original, primitive, venerable) | |
| anytime | |
| anywise | |
| apart | |
| archaic(last, original, past, venerable, outdated) | |
| at all | |
| at whatever time(expression, idiom) | |
| backward | |
| before this(expression, adverb, earlier, then, before) | |
| behind one(expression, adjective, late, old, past) | |
| bout | |
| but once(expression, adjective, adverb, past, then) | |
| by itself | |
| by now | |
| bypast(adjective, late, old, past, previous) |
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| APA | Smart Define. (2016). once thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/once/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "once thesaurus" https://smartdefine.org/once/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, once thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/once/thesaurus/synonyms>. |
| MLA | Smart Define. "once thesaurus" 30 March 2016. Web. 22 September 2026. <https://smartdefine.org/once/thesaurus/synonyms> |