Mach number

from WordNet (r) 3.0 (2006)
Mach number
    n 1: the ratio of the speed of a moving body to the speed of
         sound
from The Collaborative International Dictionary of English v.0.48
mach number \mach number\ n. (aeronautics)
   The ratio of the speed of a moving body to the speed of
   sound.
   [WordNet 1.5]
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