English version

Mach

From Longman Dictionary of Contemporary EnglishMachMach /mæk $ mɑːk/ noun [uncountable]  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
Examples from the Corpus
MachThe plane can sustain a speed of Mach 3, or three times the speed of sound.
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