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Definition of watt. : 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 : 1â746 horsepower.
watt, W(noun) a unit of power equal to 1 joule per second; the power dissipated by a current of 1 ampere flowing across a resistance of 1 ohm. Watt, James Watt(noun) Scottish engineer and inventor whose improvements in the steam engine led to its wide use in industry (1736-1819)