Definition of postmark noun from the Oxford Advanced American Dictionary

 

postmark

 noun
noun
NAmE//ˈpoʊstmɑrk//
 
 
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an official mark placed over the stamp on a letter, etc. that shows when and where it was mailed and makes it impossible to use the stamp again The envelope had an Atlanta postmark.
postmarkverb[usually passive]postmark something
 
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The card was postmarked Tokyo, March 9. an anonymous letter postmarked in Chicago