an official mark stamped on letters and other mail, serving as a cancellation of the postage stamp and indicating the place, date, and sometimes time of sending or receipt.

Is postmarked hyphenated?

Yet compounds where "post" is not a prefix but a noun referring to the mail are normally written as single words (postcard, postman, postmark). Nevertheless, the words "post office" and "post house" are retained as single words and "post-paid" and "free-post" are hyphenated.

Is post mark one word?

Word forms: postmarks

A postmark is a mark that is printed on letters and packages.