/ Dictionary / Index M mediant: Meaning and Definition of Find definitions for: me•di•ant Pronunciation: (mē'dē-unt), [key] — n. the third degree of a major or minor musical scale. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mediant (Thesaurus) median strip mediastinum Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language