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mach

or Mach

[mahk] /mɑk/
noun
1.
a number indicating the ratio of the speed of an object to the speed of sound in the medium through which the object is moving.
Abbreviation: M.
Also called mach number, Mach number.
Origin of mach
after E. Mach

Mach

[mahk; German mahkh] /mɑk; German mɑx/
noun
1.
Ernst
[ernst] /ɛrnst/ (Show IPA),
1838–1916, Austrian physicist, psychologist, and philosopher.

mach.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for mach

Mach1

/mæk/
noun
1.
short for Mach number

Mach2

/German max/
noun
1.
Ernst (ɛrnst). 1838–1916, Austrian physicist and philosopher. He devised the system of speed measurement using the Mach number. He also founded logical positivism, asserting that the validity of a scientific law is proved only after empirical testing
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for mach

Mach

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

Online Etymology Dictionary, © 2010 Douglas Harper
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mach in Science
Mach
  (mäk, mäKH)   
Austrian physicist and philosopher who experimented with supersonic projectiles and the flow of gases, obtaining early photographs of shock waves and gas jets. His work laid an important foundation for later developments in the science of projectiles and aeronautical design, and the Mach number and Mach bands were named for him.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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