Definition of postmark
(Entry 1 of 2)
: an official postal marking on a piece of mail
specifically
: a mark showing the post office and date of mailing
postmark
verb
postmarked; postmarking; postmarks
Definition of postmark (Entry 2 of 2)
: to put a postmark on
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Time Traveler for postmark
The first known use of postmark was in 1678
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