ta·​chom·​e·​ter | \ ta-ˈkä-mə-tər How to pronounce tachometer (audio) , tə- \

Definition of tachometer

: a device for indicating speed of rotation

Keep scrolling for more

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.

Examples of tachometer in a Sentence

Recent Examples on the Web Unfortunately, this large four-cylinder idles with the clatter of a diesel and is boomy through the top half of the tachometer. Scott Oldham, Car and Driver, "Tested: 2020 Cadillac CT4 450T AWD Qualifies as Mediocre," 14 Aug. 2020 And Ars readers will be glad to know there is not a single touchscreen in the T.50—all the controls are analog, as is the big tachometer directly in front of the driver. Jonathan M. Gitlin, Ars Technica, "Three seats, a V12, and a manual transmission: The GMA T.50 reveal," 4 Aug. 2020 To set the raffish Bentley apart from its stuffy stablemate Rolls-Royce, the Turbo R's cockpit boasts features like a tachometer and a gear selector that has been moved from the steering column to a much sportier position in the center console. Barry Winfield, Car and Driver, "Tested: 1994 Bentley Turbo R Brings the Old World into the New," 7 July 2020 Unfortunately, this large four-cylinder idles with the clatter of a diesel and is alarmingly boomy through the top half of the tachometer. Scott Oldham, Car and Driver, "2020 Cadillac CT4 450T Suffers from a Lack of Refinement," 8 July 2020 The gameplay shown is a spitting image of the current Gran Turismo Sport head-up display that features everything from the tachometer and mileage to live data on the level of brake and acceleration applied. Austin Irwin, Car and Driver, "First Look at Gran Turismo 7 on PlayStation 5, Coming by Year's End," 11 June 2020 The ergonomics feel sound, but the interior design is showing its age, most notably the large analogue tachometer and speedometer. Jonathan M. Gitlin, Ars Technica, "The 2020 VW Golf GTI proves you shouldn’t overcomplicate an icon," 8 June 2020 Chrome rings surround the speedometer, the tachometer, and the fuel and temperature gauges. Bradley Nevin, Car and Driver, "Tested: 2000 Mercedes-Benz ML55 Brings AMG into the SUV Fold," 3 June 2020 When the driver changes driving modes, the screen shows a different layout for the speedometer and tachometer. Dallas News, "2020 Chevrolet Corvette C8 Stingray turns all heads," 7 May 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'tachometer.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of tachometer

1810, in the meaning defined above

History and Etymology for tachometer

Greek tachos speed + English -meter

Keep scrolling for more

Learn More about tachometer

Time Traveler for tachometer

Time Traveler

The first known use of tachometer was in 1810

See more words from the same year

Statistics for tachometer

Last Updated

26 Aug 2020

Cite this Entry

“Tachometer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tachometer. Accessed 20 Sep. 2020.

Keep scrolling for more

More Definitions for tachometer


How to pronounce tachometer (audio)

English Language Learners Definition of tachometer

technical : a device that measures how fast something (such as a wheel) is turning

More from Merriam-Webster on tachometer

Britannica.com: Encyclopedia article about tachometer

Comments on tachometer

What made you want to look up tachometer? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

Homophone Quiz

  • three bears two of them look like theyre whispering to a third bear who looks chuffed to be the center of attention
  • In order to judge how people felt, the senator's office hired a firm to take a ______.
Spell It

Can you spell these 10 commonly misspelled words?

Syn City

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!