: 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

Examples of watt in a Sentence

Recent Examples on the Web
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The bill allows panels powerful enough to run a refrigerator and a few small household appliances — a maximum of 1,200 watts. — Blanca Begert, Los Angeles Times, 1 Oct. 2026 But every watt lost to idle draw while a cooler cycles, or to low-power conversion while a light stays on, is energy already paid for and carried, but never used. — New Atlas, 30 Sep. 2026 Dual 6-watt drivers push 12 watts of stereo sound, BassUp gives the low end a little extra kick, and the IPX7 waterproof build means splashes and rain aren’t a crisis. — Juhi Wadia, PC Magazine, 28 Sep. 2026 This Iniu model is compact and features 45-watt fast charge, a digital display, handy lanyard, phone stand, and flashlight. — Helen Iatrou, Travel + Leisure, 26 Sep. 2026 See All Example Sentences for watt

Word History

Etymology

James Watt †1819

First Known Use

1882, in the meaning defined above

Time Traveler
The first known use of watt was in 1882

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Cite this Entry

“Watt.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/watt. Accessed 4 Oct. 2026.

Kids Definition

: a unit of power equal to the work done at the rate of one joule per second
Etymology

named for James Watt 1736–1819 Scottish engineer

Medical Definition

: 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

Biographical Definition

James 1736–1819 Scottish inventor

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