Translate postmark | into French | into German | into Italian | into Spanish Definition of postmark
noun
an official mark stamped on a letter or other postal package, giving the place, date, and time of posting, and serving to cancel the postage stamp:an envelope with a London postmark
verb
[with object] (usually be postmarked) stamp (a letter or other postal package) officially with a postmark: [with object and complement]:the letter was postmarked New York
