/ Dictionary / Index A alter idem*: Meaning and Definition of Find definitions for: al•ter i•dem Pronunciation: (äl'ter ē'dem Eng. ôl't&schwar ī'dem, al'-), [key] — Latin. Latin. another exactly the same. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. alter ego altern Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language