Mach

Mach
n. (in full Mach number) the ratio of the speed of a body to the speed of sound in the surrounding medium.
Phrases and idioms:
Mach one (or two etc.) the speed (or twice the speed) of sound.
Etymology: E. Mach, Austrian physicist d. 1916

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I. noun (-s)
Usage: usually capitalized
Etymology: by shortening
II. abbreviation

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/mahk/, n.
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. Abbr.: M Also, Mach. Also called mach number, Mach number.
[after E. MACH]

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Mach UK [mɑːk] UK [mæk] US [mɑk] noun [countable] [singular Mach plural Machs] science
a unit for measuring the speed of an object such as an aircraft in comparison with the speed of sound. For example, Mach 5 is five times the speed of sound.
Thesaurus: units for measuring speed of movementhyponym to move somewhere quicklysynonym

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Mach «mahk, mak», noun.
Aeronautics. Mach number.
mach.,
1. machine.
2. machinery.
3. machinist.

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I [mäk; mäkh]
Ernst (1838 - 1916), Austrian physicist and philosopher of science. He did important work on aerodynamics
II
(also Mach number) n. the ratio of the speed of a body to the speed of sound in the surrounding medium. It is often used with a numeral (as Mach 1, Mach 2, etc.) to indicate the speed of sound, twice the speed of sound, etc

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/ˈmɑːk, Brit ˈmæk/ noun [noncount]
technical
— used to indicate the high speed of something (such as an airplane) by comparing it to the speed of sound

a jet flying at Mach 2 [=twice the speed of sound]

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Mach [mɑːk] [mɑːk] [mæk] [mæk] noun uncountable
(often followed by a number) a measurement of speed, used especially for aircraft. Mach 1 is the speed of sound

•

a fighter plane with a top speed of Mach 3

(= 3 times the speed of sound)
 
Word Origin:
[Mach] 1930s: named after E. Mach (1838-1916), Austrian physicist and philosopher of science.

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mach
obs. form of match n. and v.

Useful english dictionary. 2012.

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