\ ˈwät How to pronounce watt (audio) \

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 How to pronounce Watt (audio) \

Definition of Watt (Entry 2 of 2)

James 1736–1819 Scottish inventor

Examples of watt in a Sentence

Recent Examples on the Web: Noun Then there’s the battery: The Flex α makes do with a 54 watt-hour battery, compared to the 69.7Wh battery in both the 13-inch and 15-inch Flex laptops. Ben Patterson, PCWorld, "Samsung’s Galaxy Book Flex α: A slim QLED-packing 2-in-1 with a 'palatable' price tag," 2 Jan. 2020 Fluorescent bulbs emit more than 60 lumens per watt, and LEDs, or light-emitting diodes, generate more than 80 lumens. Bob Egelko, SFChronicle.com, "Ruling allows California to start enforcing efficiency standards for light bulbs," 31 Dec. 2019 The role of Ramona especially resonates in the hands of a mega-watt celebrity whose own physical attributes have been mocked and exaggerated in gross disproportion to her talent. Justin Chang, Los Angeles Times, "Jennifer Lopez is a star reborn in ‘Hustlers,’ a smart, bracing tale of strippers turned grifters," 8 Sep. 2019 The interference, decision-makers landed on, could be -33 decibel watts until 2027, at which point the limits would strengthen slightly to -39 decibel watts. Alejandra Borunda, National Geographic, "Could your next cell phone wreck our weather forecasts?," 26 Nov. 2019 European regulators and the World Meteorological Organization, a U.N. agency, took a stricter line, arguing for more strict interference limits of up to -55 decibel watts. Andrew Freedman, Washington Post, "Global 5G deal poses significant threat to weather forecast accuracy, experts warn," 22 Nov. 2019 The heating system is also improved, with larger fans that allow the machine to sustain up to 12 more watts of power. Will Egensteiner, Popular Mechanics, "Our First Impressions of the New MacBook Pro," 13 Nov. 2019 As defined by federal regulations, a low-speed e-bike has an electric motor that does not exceed 750 watts, Hyink explained. Jennifer Fisher, chicagotribune.com, "Evanston looks to regulate e-bikes, currently banned on city streets, as prelude to potential bike-share program," 19 Oct. 2019 Sense Monitor Cost: $299, or $349 with a solar power monitor, plus installation Power consumption: Less than 2 wattsSize: 5.4 inches long by 2.6 inches high by 1.3 inches deep Weight: 7.8 ounces Andy Rosen is a Boston Globe staff writer. BostonGlobe.com, "Here’s a new way to keep tabs on power usage in your home - The Boston Globe," 12 Oct. 2019

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.

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First Known Use of watt


1882, in the meaning defined above

History and Etymology for watt


James Watt †1819

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Statistics for watt

Last Updated

10 Jan 2020

Cite this Entry

“Watt.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/watt. Accessed 21 January 2020.

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More Definitions for watt


How to pronounce Watt (audio)

English Language Learners Definition of watt

: a unit for measuring electrical power


\ ˈwät How to pronounce watt (audio) \

Kids Definition of watt

: a unit for measuring electric power


\ ˈwät How to pronounce watt (audio) \

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

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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

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