Definition of postmark in English:

postmark

Line breaks: post|mark
Pronunciation: /ˈpəʊs(t)mɑːk
 
/

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: the package had a York postmark
More example sentences
  • Philately is the collection and study of postage stamps, postmarks, and related materials.
  • Old stamps with postmarks dating back about 100 years are on display.
  • Her letters would be in my hands four days after the date on the postmark.

verb

[with object] Back to top  
Stamp (a postal package) with a postmark: [with object and complement]: the letter was postmarked New York
More example sentences
  • Each entry must be mailed in a separately stamped envelope postmarked by November 30 and received by December 5.
  • The envelope was postmarked from Boston; I'd never even been to Boston.
  • Mr Daschle's envelope was postmarked Trenton, New Jersey, the same as the envelope to Brokaw.

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