/ Dictionary / Index I in mem.: Meaning and Definition of Find definitions for: in mem. Pronunciation: [key] in memoriam. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. in medias res* in memoriam Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language