19 entries under momentous topic. ×
| significant(adjective, importance, important, main, remarkable) | |
| important(adjective, important, lively, significant, remarkable) | |
| notable(adjective, importance, main, remarkable) | |
| consequential(adjective, importance, important, main, remarkable) | |
| memorable(adjective, important, lively, significant, remarkable) | |
| outstanding(adjective, importance, main, remarkable) | |
| celebrated(adjective, great, extraordinary, outstanding, remarkable) | |
| extraordinary(adjective, great, outstanding, remarkable, notable) | |
| landmark | |
| breakthrough(milestone, landmark) | |
| red-letter(adjective, great, extraordinary, outstanding, remarkable) | |
| well-known(adjective, remarkable) | |
| groundbreaking(adjective, milestone, landmark) | |
| innovative(adjective, milestone, landmark) | |
| innovatory(adjective, milestone, landmark) | |
| pioneering(adjective, milestone, landmark) | |
| radical(adjective, milestone, landmark) | |
| revolutionary(adjective, milestone, landmark) | |
| milestone |
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| APA | Smart Define. (2016). historic thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/historic/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "historic thesaurus" https://smartdefine.org/historic/thesaurus/synonyms (accessed October 1, 2026). |
| Harvard | Smart Define 2016, historic thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/historic/thesaurus/synonyms>. |
| MLA | Smart Define. "historic thesaurus" 29 March 2016. Web. 1 October 2026. <https://smartdefine.org/historic/thesaurus/synonyms> |