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Meaning of postmark

post•mark

Pronunciation: (pōst'märk"), [key]
— n.
  1. an official mark stamped on letters and other mail, serving as a cancellation of the postage stamp and indicating the place, date, and sometimes time of sending or receipt.
—v.t.
  1. to stamp with a postmark.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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