Meaning of “Mach” in the English Dictionary

british dictionary

"Mach" in British English

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Machnoun [ U ]

uk /mɑːk/ /mæk/ us /mɑːk/ /mæk/

a measurement of speed that is calculated by dividing the speed of an object, especially an aircraft, by the speed of sound

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(Definition of “Mach” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)