Try Our Apps


Avoid these words. Seriously.


[ta-kom-i-ter, tuh-] /tæˈkɒm ɪ tər, tə-/
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 forms
[tak-uh-me-trik-lee] /ˌtæk əˈmɛ trɪk li/ (Show IPA),
tachometry, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
Cite This Source
Examples from the Web for tachometer
Historical Examples
  • He watched his tachometer, which indicated his revolutions per minute.

    The Flying Reporter

    Lewis E. (Lewis Edwin) Theiss
  • His clock and his tachometer assured him that he was well past Easton.

    The Flying Reporter

    Lewis E. (Lewis Edwin) Theiss
  • I guess the first thing that Lindy watched was the tachometer.

    Famous Flyers David Goodger (
  • 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.

  • It is driven by a 220-volt motor connected to a tachometer which reads both meters per second and revolutions per minute.

  • The engine was next started and the number of revolutions of the propellers counted by a tachometer.

    Langley Memoir on Mechanical Flight, Parts I and II

    S. P. (Samuel Pierpont) Langley and Charles M. (Charles Matthews) Manly
  • It had been suggested that the revolutions in Africa occurred so often that only a tachometer could keep up with them.

    Hail to the Chief Gordon Randall Garrett
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 Forms
tachometric (ˌtækəˈmɛtrɪk), tachometrical, adjective
tachometrically, adverb
tachometry, 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
Cite This Source
Word Origin and History for tachometer

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

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
tachometer in Medicine

tachometer ta·chom·e·ter (tā-kŏm'ĭ-tər, tə-)
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.
Cite This Source

Word of the Day

Nearby words for tachometer

Word Value for tachometer

Scrabble Words With Friends