mach
/M AA1 K/noun
- 1
(physics, uncountable) A ratio of the speed (of an object, etc.) to the speed of sound in the fluid or other medium through which the object travels. Usually used to describe supersonic speeds; always precedes the Mach number.
- 2
Ernst Mach, Austrian physicist (1838–1916), born in Moravia (now Czech Republic).
- 3
A surname from Czech.
- 4
(informal, countable) Clipping of Machiavellian. [An unscrupulous schemer.]
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