a date, usually in ink, placed upon the stamps of a letter by a postal employee, used to give the reciever of the letter the date the letter was mailed and to prevent the stamp from being used again
USPS customer : I need this letter round dated with today's date!
USPS employee : Sure I'll round date that right away.
USPS employee : Sure I'll round date that right away.
by Yogi-Donnie January 26, 2008