mach number

1. 1.

   the ratio of the speed of a moving body to the speed of sound

   Broaderratio

Questions about mach number

What does mach number mean?

mach number means "the ratio of the speed of a moving body to the speed of sound".

Is mach number a common word?

mach number is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.