from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Electricity An International System unit of power equal to one joule per second. See Table at measurement.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. 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

from the GNU version of the Collaborative International Dictionary of English

  • n. A unit of power or activity equal to 107 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.

from The Century Dictionary and Cyclopedia

  • n. The practical unit of electrical activity or power. T

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. 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
  • n. Scottish engineer and inventor whose improvements in the steam engine led to its wide use in industry (1736-1819)


After James Watt.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Named after the Scottish engineer James Watt. (Wiktionary)



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