Etymology
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Mach

measure of speed relative to the speed of sound (technically Mach number), 1937, named in honor of Austrian physicist Ernst Mach (1838-1916).

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Definitions of Mach

Mach (n.)
Austrian physicist and philosopher who introduced the Mach number and who founded logical positivism (1838-1916);
Synonyms: Ernst Mach
From wordnet.princeton.edu