conservation of energy

noun Physics.
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.
Also called law of conservation of energy.


Origin:
1850–55

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Collins
World English Dictionary
conservation of energy
 
n
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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Etymonline
Word Origin & History

conservation of energy
apparently coined in Fr. by Leibnitz in 1692; attested in Eng. from early 18c. as conservatio virum vivarum or partially nativized versions of it. The exact phrase is attested from 1853.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
conservation of energy  
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.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
She wondered whether the emitted rays were violating a basic law of
  thermodynamics: the conservation of energy.
It suggests that the universe is an infinitely large, isolated system, in
  regards to conservation of energy.
The first law of thermodynamics does indeed guarantee conservation of energy.
There is no magic in that: it conforms with the principle of the conservation
  of energy and of matter.
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