/ Dictionary / Index M malfunction: Meaning and Definition of Find definitions for: mal•func•tion Pronunciation: (mal-fungk'shun), [key] — n. failure to function properly: a malfunction of the liver; the malfunction of a rocket. —v.i. to fail to function properly. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: malfunction (Thesaurus) malformed Malherbe Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language