noun
- Mail that includes letters and postcards and packages sealed against inspection.
- synonyms: first class, first-class mail, 1st-class mail
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). 1st class. Retrieved September 20, 2026, from http://smartdefine.org/1st_class/definitions/1254153 |
| Chicago | WordNet. 2010. "1st class" http://smartdefine.org/1st_class/definitions/1254153 (accessed September 20, 2026). |
| Harvard | WordNet 2010, 1st class, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/1st_class/definitions/1254153>. |
| MLA | WordNet. "1st class" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/1st_class/definitions/1254153> |