[ta-kom-i-ter, tuh-]


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

First recorded in 1800–10; tacho- + -meter
Related formstach·o·met·ri·cal·ly [tak-uh-me-trik-lee] /ˌtæk əˈmɛ trɪk li/, adverbta·chom·e·try, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for tachometer

Historical Examples of tachometer

  • His clock and his tachometer assured him that he was well past Easton.

    The Flying Reporter

    Lewis E. (Lewis Edwin) Theiss

  • He watched his tachometer, which indicated his revolutions per minute.

    The Flying Reporter

    Lewis E. (Lewis Edwin) Theiss

  • I guess the first thing that Lindy watched was the tachometer.

    Famous Flyers

    David Goodger (goodger@python.org)

  • There is a gear which serves to drive the magnetos and tachometer, also the air pump.

    Aviation Engines

    Victor Wilfred Pag

  • A tachometer was also employed to observe the number of turns that the screw was making in a minute.

British Dictionary definitions for tachometer



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
Derived Formstachometric (ˌtækəˈmɛtrɪk) or tachometrical, adjectivetachometrically, adverbtachometry, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for tachometer

1810, from Greek tachos "speed" + -meter.

Online Etymology Dictionary, © 2010 Douglas Harper

tachometer in Medicine




An instrument used to measure the rotations per minute of a rotating shaft.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.