conservation of energy

noun phrase

Definition of conservation of energy

: a principle in physics: the total energy of an isolated system remains constant irrespective of whatever internal changes may take place with energy disappearing in one form reappearing in another

First Known Use of conservation of energy

1853

in the meaning defined above

See Words from the same year

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Medical Dictionary

conservation of energy

noun

medical Definition of conservation of energy

: a principle in physics: the total energy of an isolated system remains constant irrespective of whatever internal changes may take place with energy disappearing in one form reappearing in another — called also first law of thermodynamics, law of conservation of energy