Mach

Noun

OXFORD DICTIONARY

Mach, n. (in full Mach number) the ratio of the speed of a body to the speed of sound in the surrounding medium.

Idiom

Mach one (or two etc.) the speed (or twice the speed) of sound.

Etymology

E. Mach, Austrian physicist d. 1916

For further exploring for "Mach" in Webster Dictionary Online

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