postmark

(pōstmärk′)

noun

a post-office mark stamped on a piece of mail, canceling the postage stamp and recording the date and place of sending or receiving

transitive verb

to stamp with a postmark

See postmark in American Heritage Dictionary 4

noun
An official mark printed over a postage stamp, especially one that cancels the stamp and records the date and place of mailing.
transitive verb post·marked, post·mark·ing, post·marks
To stamp with such a mark.

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