postmark

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post·mark / ˈpōstˌmärk/ • n. an official mark stamped on a letter or other postal package, giving the place, date, and time of posting, and serving to cancel the postage stamp: an envelope with a London postmark.• v. [tr.] (usu. be postmarked) stamp (a letter or other postal package) officially with such a mark: [tr.] the letter was postmarked New York.