/ Dictionary / Index P post-bag: Meaning and Definition of Find definitions for: post-bag Pronunciation: (pōst'bag"), [key] — n. Brit. mailbag. a batch of mail from a single delivery. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: post-bag (Thesaurus) postaxial postbellum Related Content Daily Word Quiz: wary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language