post·mark
ˈpōs(t)-ˌmärk 
: an official postal marking on a piece of mail
specifically
: a mark showing the post office and date of mailing
Examples of postmark in a Sentence
Verb
The package was postmarked 13 February.
Recent Examples on the Web
Catherina Gioino, Fortune, 24 Mar. 2026
The postmark is proof of when the ballot came into possession of the Post Office and left the hands of the voter.
—New York Daily News Editorial Board, New York Daily News, 23 Mar. 2026
Michael Smolens, San Diego Union-Tribune, 29 Mar. 2026
For those submitting paper returns, the IRS will consider them on time if they are correctly addressed, have sufficient postage, and are mailed and postmarked by the due date.
—Marley Malenfant, Austin American Statesman, 28 Mar. 2026
See All Example Sentences for postmark
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Noun
Starting in 2026, the USPS will no longer guarantee same-day postmarks on mailed returns, meaning taxpayers who wait until April 15 to drop their envelope in a mailbox risk having the IRS treat it as late.
—Catherina Gioino, Fortune, 24 Mar. 2026
The postmark is proof of when the ballot came into possession of the Post Office and left the hands of the voter.
—New York Daily News Editorial Board, New York Daily News, 23 Mar. 2026
Verb
By most accounts, the conservative Supreme Court majority this week appeared skeptical of a Mississippi law that allows ballots postmarked by Election Day to be counted if they are received within five business days after the election.
—Michael Smolens, San Diego Union-Tribune, 29 Mar. 2026
For those submitting paper returns, the IRS will consider them on time if they are correctly addressed, have sufficient postage, and are mailed and postmarked by the due date.
—Marley Malenfant, Austin American Statesman, 28 Mar. 2026
See All Example Sentences for postmark
Cite this Entry
“Postmark.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/postmark. Accessed 5 Apr. 2026.
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