Synonyms|3Antonyms|0|Broader|1Narrower|1Related|0
3
first class
2
first-class mail
1
1st-class mail
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APASmart Define. (2011). 1st class thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/1st_class/thesaurus/synonyms
ChicagoSmart Define. 2011. "1st class thesaurus" https://smartdefine.org/1st_class/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2011, 1st class thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/1st_class/thesaurus/synonyms>.
MLASmart Define. "1st class thesaurus" 26 April 2011. Web. 20 September 2026. <https://smartdefine.org/1st_class/thesaurus/synonyms>