| landmark(noun, adjective, mark, sign, point) | |
| event(noun, time, mark, sign, experience) | |
| milepost(noun, time, mark, sign, case) | |
| occasion(noun, action, act, time, mark) | |
| breakthrough(noun, adjective, mark, sign, achievement) | |
| marker(noun, mark, sign, sight, signpost) | |
| climax | |
| turning point(noun, expression, idiom, mark, sign) | |
| juncture(noun, action, act, time, twist) | |
| discovery(noun, mark, sign, achievement, signpost) | |
| anniversary(noun, mark, sign, achievement, signpost) | |
| post | |
| sign(noun, mark, sight, signpost, marker) | |
| sine qua non(expression, idiom) | |
| stone | |
| cairn | |
| core | |
| cornerstone | |
| crisis(noun, action, act, twist, thing) | |
| episode(noun, action, act, time, event) |
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| APA | Smart Define. (2015). milestone thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/milestone/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "milestone thesaurus" https://smartdefine.org/milestone/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, milestone thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/milestone/thesaurus/synonyms>. |
| MLA | Smart Define. "milestone thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/milestone/thesaurus/synonyms> |