n. (in full Mach number) the ratio of the speed of a body to the speed of sound in the surrounding medium. øMach one (or two etc.) the speed (or twice the speed) of sound. [E. Mach, Austrian physicist d. 1916]
MACH
Meaning of MACH in English
English main colloquial, spoken dictionary. Английский основной разговорный словарь. 2012