noun U.S. History.
a government mail service, started in 1848, for sending mail from the Mississippi to the Far West.
(initial capital letters) a stagecoach line, established in 1858, linking Memphis, St. Louis, and San Francisco, which was then paid by the government to carry U.S. mail to the Far West. With various changes in ownership, name, and routes it continued until the completion of the transcontinental railroad in 1869.
What Does “ZIP Code” Stand For?It’s a hectic time of year for the U.S. Postal Service. Those packages you ordered on Cyber Monday are steadily arriving. You’re probably even receiving a few holiday greetings the old-fashioned way — snail mail. The half million employees who work for the USPS rely heavily on the five- or nine-digit ZIP codes for efficient and reliable mail delivery. So, it makes sense that the …
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for overland mail
"The Overland-Mail" is a most desirable poem for children to learn.Poems Every Child Should Know|Various