/ Dictionary / Index M Marcian: Meaning and Definition of Find definitions for: Mar•cian Pronunciation: (mär'shun), [key] — n. a.d.392?–457, emperor of the Eastern Roman Empire 450–457. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Marcia Marciano Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language