[ 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

tach·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

British Dictionary definitions for tachometer


/ (tæˈkɒmɪtə) /


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) 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

Medicine definitions for tachometer


[ tă-kŏmĭ-tər ]


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.