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.
verb (used with object)
to stamp with a postmark.

1670–80; post3 + mark1

unpostmarked, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
postmark (ˈpəʊstˌmɑːk)
1.  See also cancellation any mark stamped on mail by postal officials, such as a simple obliteration, date mark, or indication of route
2.  (tr) to put such a mark on mail

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
She stops for a moment now, trying to again remember the postmark on that
If the postmark on the envelope is not legible, the taxpayer has the burden of
  proving the date that the postmark was made.
The envelope must remain with the file because, when material, the postmark
  establishes the filing date of the request for review.
Postmark registered items twice on the back on the crossing of the upper and
  lower flaps.
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