| compulsion(need, essential, requirement, prerequisite, essentiality) | |
| covenant | |
| crisis | |
| critical point | |
| donnee | |
| duress(need, essential, requirement, prerequisite, essentiality) | |
| element(noun, law, condition, essential, foundation) | |
| escalator clause | |
| escape clause | |
| escape hatch | |
| essential matter | |
| essentiality(need, essential, requirement, necessity, quintessence) | |
| exaction(need, essential, requirement, prerequisite, essentiality) | |
| exigency(need, essential, requirement, prerequisite, essentiality) | |
| gist | |
| given | |
| godsend(need, essential, requirement, prerequisite, essentiality) | |
| gravamen | |
| great point | |
| grounds |
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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> |