/ Dictionary / Index P pmk.: Meaning and Definition of Find definitions for: pmk. Pronunciation: [key] postmark. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. P.M.G. P.M.L. Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language