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English definition of “tachometer”

tachometer

noun [C]     /tækˈɒm.ɪ.tər/ US  /-ˈɑː.mɪ.t̬ɚ/ (informal rev counter)
a device for measuring the rate at which something turnsWeighing, measuring and counting devices
(Definition of tachometer noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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