\ ˈwät \

Definition of watt

 (Entry 1 of 2)

: the absolute meter-kilogram-second unit of power equal to the work done at the rate of one joule per second or to the power produced by a current of one ampere across a potential difference of one volt : ¹/₇₄₆ horsepower


biographical name
\ ˈwät \

Definition of Watt (Entry 2 of 2)

James 1736–1819 Scottish inventor

Examples of watt in a Sentence

Recent Examples on the Web: Noun

Many were bedecked in Boucheron’s high watt wares that dazzled in the light of over a thousand candles light for the occasion. Lilah Ramzi, Vogue, "Jewelry Maison Boucheron Reopens its Place Vendôme Boutique With a Sparkling Dinner," 21 Jan. 2019 Where the processor in your smartphone uses about one watt of power, the power consumption of some of these chips is measured in microwatts—a million times less. Christopher Mims, WSJ, "Here Comes ‘Smart Dust,’ the Tiny Computers That Pull Power from the Air," 8 Nov. 2018 While a high-end gaming PC often draws up to 500 watts of power, Carmack said the Quest only uses about 5W, a tidbit that should be of benefit to the Quest's still unconfirmed battery-life statistics. Kyle Orland, Ars Technica, "Carmack compares Oculus Quest hardware power to last-gen game consoles," 27 Sep. 2018 The watt balance used to calculate Planck's constant was built by the US National Institute of Standards and Technology (NIST). Avery Thompson, Popular Mechanics, "Scientists Can Now Define the Kilogram In Terms of Raw Physics," 22 June 2016 For the first time, the new Pixels will support wireless charging (at up to 10 watts), and Google is introducing its own charging stand — the Pixel Stand — as an optional accessory. Chris Welch, The Verge, "Google Pixel 3 and 3 XL announced with bigger screens and best cameras yet," 9 Oct. 2018 After releasing its first official iPhone XR cases today, Apple has also added another new accessory to the Apple Store: an 18 watt USB-C power adapter. Stefan Etienne, The Verge, "You can now buy Apple’s $29 USB-C fast chargers," 5 Dec. 2018 The panels provide as much as 700 watts on a clear day. Joe Pappalardo, Popular Mechanics, "NASA's Mars InSight Lander Just Nailed Another Major Milestone," 27 Nov. 2018 However, when overclocked, this power usage jumped considerably, reaching just over 200 watts. Richard Baguley, Ars Technica, "Review: Intel’s 9th Gen Core i9 9900K processor hits 5GHz—just at a price," 17 Nov. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'watt.' 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 watt


1882, in the meaning defined above

History and Etymology for watt


James Watt †1819

Keep scrolling for more

Learn More about watt

Dictionary Entries near watt








Statistics for watt

Last Updated

21 Feb 2019

Look-up Popularity

Time Traveler for watt

The first known use of watt was in 1882

See more words from the same year

Keep scrolling for more

More Definitions for watt



English Language Learners Definition of watt

: a unit for measuring electrical power


\ ˈwät \

Kids Definition of watt

: a unit for measuring electric power


\ ˈwät \

Medical Definition of watt

: the absolute mks unit of power equal to the work done at the rate of one joule per second or to the power produced by a current of one ampere across a potential difference of one volt : ¹/₇₄₆ horsepower

Keep scrolling for more

More from Merriam-Webster on watt

Rhyming Dictionary: Words that rhyme with watt

Spanish Central: Translation of watt

Nglish: Translation of watt for Spanish Speakers

Britannica English: Translation of watt for Arabic Speakers

Britannica.com: Encyclopedia article about watt

Comments on watt

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


excited commotion or publicity

Get Word of the Day daily email!

Test Your Vocabulary

What did you just call me?! A Quiz

  • rows-of-various-emoji
  • If a member of the audience describes your speech as bombastic, does that person mean it is:
Name That Thing

Test your visual vocabulary with our 10-question challenge!


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!