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What does M stand for?

M stands for Mach (multiple of speed of sound)

This definition appears very frequently

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We have 1 other meaning of M in our Acronym Attic

Samples in periodicals archive:

00 Hardcover QC16 The Influence of Austrian physicist and philosopher Mach (1838-191) on six groups of people is explored in turn.
The plane, dubbed HyperSoar, could attian a hypersonic top speed of 3 kilometers per second, or Mach 10--10 times the speed of sound, it could transport freight and people, strike enemy targets, or help propel payloads into space, in most uses, it would not only go places faster but would also haul more load per kilogram of aircraft than existing planes or rockets do, says Preston H.