1
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fourth
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increase fourfold(verb, expression, idiom)
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quadrigeminal(noun, adjective)
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quadrivium
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APASmart Define. (2016). quadruple thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/quadruple/thesaurus/synonyms
ChicagoSmart Define. 2016. "quadruple thesaurus" https://smartdefine.org/quadruple/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, quadruple thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/quadruple/thesaurus/synonyms>.
MLASmart Define. "quadruple thesaurus" 5 February 2016. Web. 23 September 2026. <https://smartdefine.org/quadruple/thesaurus/synonyms>