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From The Collaborative International Dictionary of English v.0.48:
Watt \Watt\, n. [From the distinguished mechanician and scientist, James Watt.] (Physics) A unit of power or activity equal to 10^7 C.G.S. units of power, or to work done at the rate of one joule a second. An English horse power is approximately equal to 746 watts. [1913 Webster]