| inexorableness(need, essential, requirement, essentiality) | |
| integral(important, essential, critical, basic, fundamental) | |
| involuntary(adjective, required) | |
| irreducible | |
| irreductible | |
| irreplaceable | |
| joker | |
| key(important, essential, critical, basic, fundamental) | |
| kicker | |
| life-or-death(important, essential, critical, basic, fundamental) | |
| life or death(expression, idiom, need, essential, basic) | |
| limitation(noun, form, fix, pass, position) | |
| limiting condition | |
| longing(noun, want, essential, requirement, necessity) | |
| makeready | |
| making ready | |
| manufacture | |
| meaningful(important, essential, critical, fundamental, decisive) | |
| meat-and-potatoes(important, essential, critical, basic, fundamental) | |
| mobilization |
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| APA | Smart Define. (2015). prerequisite thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/prerequisite/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "prerequisite thesaurus" https://smartdefine.org/prerequisite/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, prerequisite thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/prerequisite/thesaurus/synonyms>. |
| MLA | Smart Define. "prerequisite thesaurus" 4 September 2015. Web. 22 September 2026. <https://smartdefine.org/prerequisite/thesaurus/synonyms> |