This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. An official mark printed over a postage stamp, especially one that cancels the stamp and records the date and place of mailing.

v. To stamp with such a mark.

n. A marking made by a postal service on a letter, package, postcard or the like, usually indicating the place where and the date and time when the item was received or processed for the first time, and often serving to cancel a postage stamp.

v. To apply a postmark on.

n. The mark, or stamp, of a post office on a letter, giving the place and date of mailing or of arrival.

v. To mark with a post-office stamp.

n. The mark or stamp of a post-office placed on a letter, paper, card, or package sent through the mail; an official stamp on a letter, etc., giving the place and date of sending or the place and date of receipt.

To affix the stamp or mark of the post-office to, as letters, etc.

v. stamp with a postmark to indicate date and time of mailing

n. a cancellation mark stamped on mail by postal officials; indicates the post office and date of mailing

"And finally, I managed to nearly finish my postcards for International Women's Day - all that remains to do is the satin stitch around the edges, and they can go off in the post this afternoon, with a March 8th postmark, which is appropriate, if slightly later than I have hoped to have them posted."

postmarked    postmarking    postmarks   

stamp    marker    mark    marking   

postmarked    postmarking   

chirography    roomie    superscription    postage    45-day