postmark

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

To stamp with such a mark.

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.

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

To mark with a post-office stamp.

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.

To apply a postmark on.

stamp with a postmark to indicate date and time of mailing

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