Pony Express Syllabification: (Po·ny Ex·press)Definition of Pony Express a system of mail delivery operating from 1860 to 1861 over a distance of 1,800 miles (2,900 km) between St. Joseph, Missouri, and Sacramento, California, using continuous relays of horse riders. Pony Express in other Oxford dictionaries Definition of Pony Express in the British & World English dictionary
