Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun 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 the GNU version of the Collaborative International Dictionary of English.
- noun (aeronautics) The ratio of the speed of a moving body to the speed of sound.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics The
ratio of thevelocity of abody to that ofsound in thesurrounding medium .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the ratio of the speed of a moving body to the speed of sound
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[After Ernst Mach.]
from Wiktionary, Creative Commons Attribution/Share-Alike License
After the physicist Ernst Mach.
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