57 entries under required topic. ×

1
fundamental(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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paramount(adjective, authority, significant, essential, basic)
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proviso
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quintessential(adjective, significant, essential, basic, vital)
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specified(adjective, significant, essential, basic, vital)
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stipulated
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wanted(adjective, significant, essential, basic, vital)
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bottom-line(adjective, significant, essential, basic, vital)
0
counted upon(expression, necessary, obligatory, conclusive)
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elementary(adjective, significant, essential, basic, vital)
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indissoluble(necessary, obligatory, conclusive)
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momentous(adjective, significant, essential, basic, vital)
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prime(adjective, significant, essential, basic, vital)
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principal(adjective, significant, essential, basic, vital)
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significant(adjective, essential, basic, vital)
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APASmart Define. (2015). compulsory thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/compulsory/thesaurus/synonyms
ChicagoSmart Define. 2015. "compulsory thesaurus" https://smartdefine.org/compulsory/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, compulsory thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/compulsory/thesaurus/synonyms>.
MLASmart Define. "compulsory thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/compulsory/thesaurus/synonyms>