Mach Syllabification: (Mach)Pronunciation: /mäk/ (also Mach number)Definition of Mach noun the ratio of the speed of a body to the speed of sound in the surrounding medium. It is often used with a numeral (as Mach 1, Mach 2, etc.) to indicate the speed of sound, twice the speed of sound, etc.. Mach in other Oxford dictionaries Definition of Mach in the British & World English dictionary
