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English definition of “postmark”

postmark

noun [C]  /ˈpoʊstˌmɑrk/ us  
an official mark on letters or packages, showing the place and day, month, and year of mailing
postmark
verb [T]  /ˈpoʊstˌmɑrk/ us  
Contest entries must be postmarked no later than July 16.
(Definition of postmark from the Cambridge Academic Content Dictionary © Cambridge University Press)
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