| twenty-eight(noun, adjective) | |
| xxviii | |
| XXVIII | |
| cardinal |
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| APA | Smart Define. (2013). 28 thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/28/thesaurus/synonyms |
| Chicago | Smart Define. 2013. "28 thesaurus" https://smartdefine.org/28/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2013, 28 thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/28/thesaurus/synonyms>. |
| MLA | Smart Define. "28 thesaurus" 17 June 2013. Web. 21 September 2026. <https://smartdefine.org/28/thesaurus/synonyms> |