• synonyms


[kil-uh-wot-ouuh r, -ou-er]
See more synonyms for kilowatt-hour on Thesaurus.com
  1. a unit of energy, equivalent to the energy transferred or expended in one hour by one kilowatt of power; approximately 1.34 horsepower-hours. Abbreviation: kWh, K.W.H., kwhr
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Origin of kilowatt-hour

First recorded in 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for kwh

Historical Examples

  • This tells you the number of kwh used by the appliance during the month.

    Electricity for the 4-H Scientist

    Eric B. Wilson

  • A kilowatt is usually indicated by "kw" and a kilowatt hour by "kwh."

  • Ten 100-watt light bulbs burning for one hour would use one kilowatt-hour—one kwh.

British Dictionary definitions for kwh


abbreviation for
  1. kilowatt-hour
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  1. a unit of energy equal to the work done by a power of 1000 watts in one hourSymbol: kWh
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

kwh in Science


  1. A unit used to measure energy, especially electrical energy in commercial applications. One kilowatt-hour is equal to one kilowatt of power produced or consumed over a period of one hour, or 3.6 X 106 joules.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

kwh in Culture



A unit of energy: the expenditure of one kilowatt of power for one hour. A toaster running for an hour will use about this much energy.

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The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.