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quintessential(adjective, important, significant, essential, basic)
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stipulated
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de rigueur(expression, adjective, significant, essential, basic)
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expedient(adjective, significant, essential, basic, vital)
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incumbent on(expression, adjective, significant, essential, basic)
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name of game(expression, adjective, idiom, significant, essential)
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specified(adjective, significant, essential, basic, vital)
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APASmart Define. (2015). indispensable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/indispensable/thesaurus/synonyms
ChicagoSmart Define. 2015. "indispensable thesaurus" https://smartdefine.org/indispensable/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, indispensable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/indispensable/thesaurus/synonyms>.
MLASmart Define. "indispensable thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/indispensable/thesaurus/synonyms>