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  • watt
    watt
    noun
    the standard unit of power in the International System of Units (SI), equivalent to one joule per second and equal to the power in a circuit in which a current of one ampere flows across a potential difference of one volt. W, w.
  • Watt
    Watt
    noun
    James, 1736–1819, Scottish engineer and inventor.

watt

1 American  
[wot] / wɒt /

noun

  • watts
    plural
  1. the standard unit of power in the International System of Units (SI), equivalent to one joule per second and equal to the power in a circuit in which a current of one ampere flows across a potential difference of one volt. W, w.


Watt 2 American  
[wot] / wɒt /

noun

  1. James, 1736–1819, Scottish engineer and inventor.


Watt 1 British  
/ wɒt /

noun

  1. James. 1736–1819, Scottish engineer and inventor. His fundamental improvements to the steam engine led to the widespread use of steam power in industry

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

watt 2 British  
/ wɒt /

noun

  1. W. the derived SI unit of power, equal to 1 joule per second; the power dissipated by a current of 1 ampere flowing across a potential difference of 1 volt. 1 watt is equivalent to 1.341 × 10 –3 horsepower

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

watt 1 Scientific  
/ wŏt /
  1. The SI derived unit used to measure power, equal to one joule per second. In electricity, a watt is equal to current (in amperes) multiplied by voltage (in volts).


Watt 2 Scientific  
  1. British engineer and inventor who patented a much improved version of the steam engine (1769) and devised the unit of horsepower. The watt unit of power is named for him.


watt Cultural  
  1. The basic unit of power, named after the eighteenth-century Scottish inventor James Watt.


Other Word Forms

Noun Inflected Forms


Etymology

Origin of watt

First recorded in 1882; named after J. Watt


Vocabulary lists containing watt

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Each incremental watt is worth $8 to Amazon currently, according to Nowak.

From MarketWatch ● Aug. 17, 2026

Early tests show that the chip will deliver performance per watt “substantially better” than current state-of-the-art chips, they added.

From The Wall Street Journal ● Jun. 24, 2026

Developers spend most of a project’s cost before a single watt of energy gets sold, then recover it through power sales stretched across 20 years or more.

From Barron's ● Jun. 6, 2026

Measurements revealed a responsivity of 2.7 amperes per watt.

From Science Daily ● May 31, 2026

They had discovered the X ray, the cathode ray, the electron, and radioactivity, invented the ohm, the watt, the Kelvin, the joule, the amp, and the little erg.

From "A Short History of Nearly Everything" by Bill Bryson

In a video posted Wednesday on his X account, Watt said it is “humbling” to be in such a position.

From Los Angeles Times ● Oct. 22, 2026

Watt was elevated to be Romo’s interim replacement, alongside Jim Nantz, but no announcement has been made about that permanent role.

From The Wall Street Journal ● Oct. 20, 2026

“Catching one guy means there are half a dozen out there,” said Randy Watt, president of leadership consulting firm SRW, which conducts security and threat assessments for companies.

From The Wall Street Journal ● Oct. 15, 2026

Watt: His voice moves me in a way that I don’t even know what’s happening.

From Los Angeles Times ● Oct. 13, 2026

It also overstates the importance of rare geniuses, such as Watt and Edison.

From "Guns, Germs, and Steel: The Fates of Human Societies" by Jared M. Diamond

One gigawatt represents 1 billion watts of power, enough to electrify more than 800,000 homes, according to various estimates.

From MarketWatch ● Nov. 5, 2026

The testing body said it’s concerned that systems under 400 watts can still overheat electrical components in a home and create a fire risk.

From Los Angeles Times ● Oct. 27, 2026

They press vinyl to sell at shows, and it gets into the hands of disc jockeys at ever-larger radio stations with an increasing number of watts behind their broadcasts.

From Salon ● Oct. 4, 2026

Other essentials, such as the kettle which needs 3 kilowatts of electricity, will be powered through a mix of the 800 watts flowing from the panel with the rest coming from the national grid.

From BBC ● Aug. 26, 2026

So what happens to the other 1400 watts?

From "The Martian" by Andy Weir

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