/ Dictionary / Index M mach: Meaning and Definition of Find definitions for: mach Pronunciation: (mäk), [key] — n. a number indicating the ratio of the speed of an object to the speed of sound in the medium through which the object is moving. Abbr.: M Also called[after E. Mach] Mach Pronunciation: (mäk Ger. mä&khlig), [key] — n. 1838–1916, Austrian physicist, psychologist, and philosopher. mach. Pronunciation: [key] machine. machinery. machinist. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mach (Thesaurus) macfarlane Machabees Related Content Daily Word Quiz: overture Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language