Meaning of “postmark” in the English Dictionary

"postmark" in American English

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postmarknoun [ C ]

us /ˈpoʊstˌmɑrk/

an official mark on letters or packages, showing the place and day, month, and year of mailing

postmark
verb [ T ] us /ˈpoʊstˌmɑrk/

Contest entries must be postmarked no later than July 16.

(Definition of “postmark” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"postmark" in Business English

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postmarknoun [ C ]

uk /ˈpəʊstmɑːk/ us COMMUNICATIONS

an official mark put on a letter or package, showing the place that it was sent from and the time or date that it was sent:

Twenty-four letters were delivered with a Washington D.C. postmark.

postmarkverb [ T/usually passive ]

uk /ˈpəʊstmɑːk/ us

to put an official mark on a letter or package, showing the place that it was sent from and the time or date that it was sent:

be postmarked Applications must be postmarked by Oct. 1.

(Definition of “postmark” from the Cambridge Business English Dictionary © Cambridge University Press)