Dictionary

Mach number

noun \ˈmäk-\

Definition of MACH NUMBER

:  a number representing the ratio of the speed of a body (as an aircraft) to the speed of sound in a surrounding medium (as air)

Origin of MACH NUMBER

Ernst Mach †1916 Austrian physicist
First Known Use: 1937
Medical Dictionary

Mach number

noun \ˈmäk-\

Medical Definition of MACH NUMBER

:  a number representing the ratio of the speed of a body to the speed of sound in a surrounding medium (as air) <a Mach number of 2 indicates a speed that is twice that of sound>

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