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English definition of “postmark”

postmark

noun [C]     /ˈpəʊst.mɑːk/ US  /ˈpoʊst.mɑːrk/
an official mark put on a letter or parcel , typically showing the place that it was sent from and the time or date that it was sent The postal system postmark     verb [T]
(Definition of postmark noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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