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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), The SI unit of electrical power; the power available when the current is 1 ampere and the electromotive force is 1 volt; equal to 1 joule (107 ergs) per second or 1 voltampere. watt. (W) (waht) the SI unit of power, being the work done at the rate of 1 joule per second.