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
Evan Moore, Charlotte Observer, 7 Jan. 2026
According to the Federal Register — the federal government’s official journal — the Postal Service is adding a new section to its mail rulebook to better explain how postmarks work.
—Sacbee.com, 6 Jan. 2026
Grace Hase, Mercury News, 31 Dec. 2025
While April 15 is when federal taxes are due, the IRS considers any tax return postmarked on or before April 15 as being filed on time, even if it’s not received until days later.
—Sarah Agostino, CNBC, 31 Dec. 2025
See All Example Sentences for postmark
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Noun
In some cases, postmarks may also be faint or unreadable.
—Evan Moore, Charlotte Observer, 7 Jan. 2026
According to the Federal Register — the federal government’s official journal — the Postal Service is adding a new section to its mail rulebook to better explain how postmarks work.
—Sacbee.com, 6 Jan. 2026
Verb
But that number will grow as mail-in ballots can be counted as long as they were postmarked on Election Day and received within seven days.
—Grace Hase, Mercury News, 31 Dec. 2025
While April 15 is when federal taxes are due, the IRS considers any tax return postmarked on or before April 15 as being filed on time, even if it’s not received until days later.
—Sarah Agostino, CNBC, 31 Dec. 2025
See All Example Sentences for postmark
Cite this Entry
“Postmark.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/postmark. Accessed 8 Jan. 2026.
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