/ Dictionary / Index P postmark: Meaning and Definition of Find definitions for: post•mark Pronunciation: (pōst'märk"), [key] — n. an official mark stamped on letters and other mail, serving as a cancellation of the postage stamp and indicating the place, date, and sometimes time of sending or receipt. —v.t. to stamp with a postmark. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: postmark (Thesaurus) postman postmaster Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language