/ Dictionary / Index P post meridiem: Meaning and Definition of Find definitions for: post me•rid•i•em Pronunciation: (pōst' mu-rid'ē-um, -em"). [key] See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. postmeridian postmill Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language