| expressive | |
| fact(noun, action, act, event, thing) | |
| fool's cap(expression, idiom, indication) | |
| function(noun, action, act, thing, experience) | |
| go(noun, time, event, case, occurrence) | |
| goings-on(noun, time, case, juncture) | |
| grave | |
| groundbreaking(adjective, momentous, landmark) | |
| height | |
| high-water mark(noun, expression, occasion) | |
| highlight | |
| historical | |
| holiday(noun, action, act, thing, experience) | |
| honor | |
| iconic | |
| impossible | |
| indicative | |
| indicator(noun, mark, sign, signpost, marker) | |
| instance(noun, time, event, case, occurrence) | |
| key event(expression, idiom) |
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| APA | Smart Define. (2015). milestone thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/milestone/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "milestone thesaurus" https://smartdefine.org/milestone/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, milestone thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/milestone/thesaurus/synonyms>. |
| MLA | Smart Define. "milestone thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/milestone/thesaurus/synonyms> |