POSTMARK

postmark

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

postmark, frank

(verb) stamp with a postmark to indicate date and time of mailing

Source: WordNet® 3.1

Etymology

Noun

postmark (plural postmarks)

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.

Verb

postmark (third-person singular simple present postmarks, present participle postmarking, simple past and past participle postmarked)

To apply a postmark on.

Source: Wiktionary

Post"mark`, n.

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

Post"mark`, v. t. [imp. & p. p. Postmarked; p. pr. & vb. n. Postmarking.]

Definition: To mark with a post-office stamp; as, to postmark a letter or parcel.

Source: Webster’s Unabridged Dictionary 1913 Edition