Definition of energy in English:


Syllabification: en·er·gy
Pronunciation: /ˈenərjē

noun (plural energies)

  • 2Power derived from the utilization of physical or chemical resources, especially to provide light and heat or to work machines.
    More example sentences
    • These include global warming, energy efficiency and renewable energy resources.
    • It will also provide virtually unlimited energy and material resources for humankind.
    • That efficiency will include solar power, recyclable energy and heat retention.
  • 3 Physics The property of matter and radiation that is manifest as a capacity to perform work (such as causing motion or the interaction of molecules): a collision in which no energy is transferred
    More example sentences
    • Why is that electrons radiate electromagnetic energy when they are accelerated?
    • If a particle moves faster than the speed of light, it must create a shockwave, and radiate energy.
    • The protons are set in motion and, being charged, they again deposit energy through electrical interactions.
  • 3.1A degree or level of energy possessed by something or required by a process.
    More example sentences
    • We have seen that in an atom, possible electron energies come in a discrete series of distinct levels.
    • The enormous energies required to do this are needed to reveal the quantum nature of gravity.
    • These particles should appear in profusion only at the very high energies at which the unification takes place.


mid 16th century (denoting force or vigor of expression): from French énergie, or via late Latin from Greek energeia, from en- 'in, within' + ergon 'work'.

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