1900-2000 Ernst Mach (1838-1916), Austrian scientist
Examples
EXAMPLES FROM OTHER DICTIONARIES
The plane can sustain a speed of Mach 3, or three times the speed of sound.
a unit for measuring speed, especially of an aircraft, in relation to the speed of sound. Mach 1 is the speed of sound, Mach 2 is twice the speed of sound etc: a plane with a maximum speed of Mach 3