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conservation of energy

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noun Physics.
  1. the principle that in a system that does not undergo any force from outside the system, the amount of energy is constant, irrespective of its changes in form.
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Origin of conservation of energy

First recorded in 1850–55
Also called law of conservation of energy.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for conservation of energy

Historical Examples

  • We have already seen that Dr. Mayer, of conservation-of-energy fame, was the first to ask this question.

    A History of Science, Volume 5(of 5)

    Henry Smith Williams


British Dictionary definitions for conservation of energy

conservation of energy

noun
  1. the principle that the total energy of any isolated system is constant and independent of any changes occurring within the system
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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

Word Origin and History for conservation of energy

apparently coined in French by Leibnitz in 1692; attested in English from early 18c. as conservatio virum vivarum or partially nativized versions of it. The exact phrase is attested from 1853.

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Online Etymology Dictionary, © 2010 Douglas Harper

conservation of energy in Science

conservation of energy

  1. A principle stating that the total energy of a closed system remains constant over time, regardless of other possible changes within the system. It is related to the symmetry of time invariance. See also invariance thermodynamics.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.