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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.
Wiktionary (0.00 / 0 votes) Rate this definition: watt (Noun). In the International System of Units, the derived unit of power; the power of a system in which one joule of energy is transferred per second. Symbol: W. Watt (ProperNoun). An English and Scottish surname derived from the given name Wat.iktionary (0.00 / 0 votes) Rate this definition: watt (Noun). In the International System of Units, the derived unit of power; the power of a system in which one joule of energy is transferred per second. Symbol: W. Watt (ProperNoun). An English and Scottish surname derived from the given name Wat.