IPA: /ˈpoʊstˌmɑrk/
KK: /ˈpoʊstˌmɑrk/
A mark made by the post office on a piece of mail to show when and where it was sent, often covering the postage stamp.
The letter had a postmark from New York dated yesterday.
To place a stamp on a letter or package to show the date and place it was sent from.
She decided to postmark the letter before sending it off.
Past: postmarked
Past Participle: postmarked
Postmark → It is formed from "post" (from Latin *postis*, meaning after or behind) and "mark" (from Old English *mearc*, meaning a sign or boundary). The word "postmark" refers to a mark indicating that a letter has been sent after a certain point in time.
Think of a 'mark' that shows when something was sent 'after' — that's what a postmark indicates.