Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The ratio of the speed of an object to the speed of sound in the surrounding medium. For example, an aircraft moving twice as fast as the speed of sound is said to be traveling at Mach 2.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The ratio of the velocity of a body to that of sound in the surrounding medium.

from the GNU version of the Collaborative International Dictionary of English

  • n. The ratio of the speed of a moving body to the speed of sound.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the ratio of the speed of a moving body to the speed of sound

Etymologies

After Ernst Mach.
(American Heritage® Dictionary of the English Language, Fourth Edition)
After the physicist Ernst Mach. (Wiktionary)

Examples

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