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Definition of postmark noun from the Oxford Advanced Learner's Dictionary

postmark

noun
 
/ˈpəʊstmɑːk/
 
/ˈpəʊstmɑːrk/
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  1. an official mark placed over the stamp on a letter, etc. that shows when and where it was posted and makes it impossible to use the stamp again
    • The envelope had an Atlanta postmark.
See postmark in the Oxford Advanced American Dictionary

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