- any of various instruments for measuring or indicating velocity or speed, as of a machine, a river, or the blood.
- an instrument measuring revolutions per minute, as of an engine.
Origin of tachometer
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- any device for measuring speed, esp the rate of revolution of a shaft. Tachometers (rev counters) are often fitted to cars to indicate the number of revolutions per minute of the engine
Word Origin and History for tachometry
1810, from Greek tachos "speed" + -meter.
Online Etymology Dictionary, © 2010 Douglas Harper
- An instrument used to measure the rotations per minute of a rotating shaft.