Synonyms|5Antonyms|0|Broader|1Narrower|0Related|1
4
21
4
twenty-one
1
21
-1
21st
-1
cardinal
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APASmart Define. (2013). xxi thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/xxi/thesaurus/synonyms
ChicagoSmart Define. 2013. "xxi thesaurus" https://smartdefine.org/xxi/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2013, xxi thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/xxi/thesaurus/synonyms>.
MLASmart Define. "xxi thesaurus" 17 June 2013. Web. 20 September 2026. <https://smartdefine.org/xxi/thesaurus/synonyms>