| no alternative(expression, need, essential, requirement, prerequisite) | |
| no choice(expression, need, essential, requirement, prerequisite) | |
| nub | |
| parameter | |
| pinch(need, essential, requirement, prerequisite, essentiality) | |
| pith | |
| pivot | |
| principle(noun, law, condition, essential, foundation) | |
| privation(need, essential, requirement, prerequisite, essentiality) | |
| provisions | |
| qua | |
| real issue | |
| rock bottom(expression, law, foundation, basic, stipulation) | |
| rudiment(noun, law, condition, foundation, essence) | |
| salient point | |
| saving clause | |
| starting point(expression, theory, guesstimate, premise) | |
| string | |
| substance | |
| substantive point |
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| APA | Smart Define. (2015). sine qua non thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/sine_qua_non/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "sine qua non thesaurus" https://smartdefine.org/sine_qua_non/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2015, sine qua non thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/sine_qua_non/thesaurus/synonyms>. |
| MLA | Smart Define. "sine qua non thesaurus" 10 April 2015. Web. 30 September 2026. <https://smartdefine.org/sine_qua_non/thesaurus/synonyms> |