Watt

UK: /ˈwɒt/ US: /wɑt/ ,(wot)

WordReference Random House Learner's Dictionary of American English © 2026

watt /wɑt/   n. [countable]

1. Electricity a unit of electrical power equivalent to one joule per second.Abbr.: W, w

WordReference Random House Unabridged Dictionary of American English © 2026

watt  (wot), n. 

1. Electricity the SI unit of power, 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. Abbr.: W, w.

• named after J. Watt 1882

Watt  (wot), n. 

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

Collins Concise English Dictionary © HarperCollins Publishers::

watt / wɒt/ noun

1. 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
   Symbol: W

Etymology: 19th Century: named after James Watt