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tachometer

ta·chom·e·ter [ ta-ˈkä-mə-tər]

tachometer

noun

[ta-ˈkä-mə-tər]

Definition of tachometer

: a device for indicating speed of rotation

Did You Know

A tachometer is literally a "speed-measurer", since the Greek root tach- means "speed". This is clear in the names of the tachyon, a particle of matter that travels faster than the speed of light (if it actually exists, it's so fast that it's impossible to see with any instrument), and tachycardia, a medical condition in which the heart races uncontrollably. Since the speed that an auto tachometer measures is speed of rotation of the crankshaft, the numbers it reports are revolutions per minute, or rpm's.

Recent Examples on the Web

//There are large analog speedometer and tachometer dials, with an analog fuel gauge on the right and battery charge indicator on the left.
— Eric Bangeman, Ars Technica, "Love the hardware, hate the UI: The Acura MDX Sport Hybrid," 13 Dec. 2018
//The adaptive cruise icon appears illuminated on the bottom left of the dashboard, below the tachometer.
— Robert Duffer, chicagotribune.com, "Tesla, Volvo, Cadillac: Which semi-automated driving system is best?," 5 Oct. 2017
//No paddle shifters, no problem — and no tachometer, either.
— San Diego Union-Tribune, "Rolls-Royce Cullinan SUV: a royal rite of passage," 2 Aug. 2019
//The shifts are so smooth it might be mistaken for a continuously variable transmission if not for the slight blip of the tachometer.
— Robert Duffer, chicagotribune.com, "2018 Volkswagen Atlas carries 3-row SUV class on its shoulders," 16 Jan. 2018
//My preferred setting was that of a tachometer, or rev counter.
— Jonathan M. Gitlin, Ars Technica, "The 2018 Honda Accord proves there’s still life in the family sedan," 15 June 2018
//Giving the tachometer a white background costs $979 but the sport exhaust is only $844, so there are some bargains left in the world.
— Ezra Dyer, Popular Mechanics, "The Ferrari "Family Car" Still Spits Fire," 24 Aug. 2018
//To be a decent street engine, the Valkyrie's had to make a solid chunk of its power much lower on the tachometer.
— Matthew Jancer, Popular Mechanics, "Pride of the Valkyries," 29 Jan. 2019
//One of my favorite features, and this is rolling out in most GM cars, is the selectable display in the instrument cluster between the tachometer and speedometer.
— Robert Duffer, chicagotribune.com, "Auto review: 2017 Buick LaCrosse is a good car at a bad time," 15 Aug. 2017

First Known Use of tachometer

1810, in the meaning defined above

History and Etymology for tachometer

Greek tachos speed + English -meter

Dictionary Entries near tachometer