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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.
Freebase (0.00 / 0 votes) Rate this definition: Watt. The watt is a derived unit of power in the International System of Units, named after the Scottish engineer James Watt. The unit, defined as one joule per second, measures the rate of energy conversion or transfer.