Similar words: number, numbers, number 1, in number, number one, outnumber, renumber, numbered. Meaning: [mɑːk] 
n. the ratio of the speed of a moving body to the speed of sound.
n. the ratio of the speed of a moving body to the speed of sound. 
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31 FL-7 is a continuous transonic wind tunnel, which is powered by three engines. Mach number is adjusted by the rotating speed of engines, the flexible wall nozzle and the by-pass valve.
More similar words: number, numbers, number 1, in number, number one, outnumber, renumber, numbered, a number of, numbering, call number, lot number, pin number, odd number, any number of, wavenumber, base number, page number, unnumbered, real number, even number, numberless, whole number, a hot number, phone number, number line, part number, mass number, random number, model number.