noun
- Express mail carried by relays of riders on horseback; especially between Missouri and California around 1860. .
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). pony express. Retrieved September 21, 2026, from http://smartdefine.org/pony_express/definitions/1215731 |
| Chicago | WordNet. 2010. "pony express" http://smartdefine.org/pony_express/definitions/1215731 (accessed September 21, 2026). |
| Harvard | WordNet 2010, pony express, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/pony_express/definitions/1215731>. |
| MLA | WordNet. "pony express" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/pony_express/definitions/1215731> |