en·​er·​gy | \ ˈe-nər-jē How to pronounce energy (audio) \
plural energies

Definition of energy

1a : dynamic quality narrative energy
b : the capacity of acting or being active intellectual energy
c : a usually positive spiritual force the energy flowing through all people
2 : vigorous exertion of power : effort investing time and energy
3 : a fundamental entity of nature that is transferred between parts of a system in the production of physical change within the system and usually regarded as the capacity for doing work
4 : usable power (such as heat or electricity) also : the resources for producing such power

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Synonyms for energy


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Choose the Right Synonym for energy

power, force, energy, strength, might mean the ability to exert effort. power may imply latent or exerted physical, mental, or spiritual ability to act or be acted upon. the awesome power of flowing water force implies the actual effective exercise of power. used enough force to push the door open energy applies to power expended or capable of being transformed into work. a worker with boundless energy strength applies to the quality or property of a person or thing that makes possible the exertion of force or the withstanding of strain, pressure, or attack. use weight training to build your strength might implies great or overwhelming power or strength. the belief that might makes right

Examples of energy in a Sentence

The kids are always so full of energy. They devoted all their energy to the completion of the project. They devoted all their energies to the completion of the project. She puts a lot of energy into her work. The newer appliances conserve more energy.
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Recent Examples on the Web At hospital, doctors told Harima to replenish his energy with fizzy soda drinks. Emiko Jozuka, CNN, "The 'Sweat' you drink: Inside the meteoric rise of Asia's answer to Gatorade," 1 Aug. 2020 Abe Pollin emerged from his in part by building an affordable housing project named for his daughter in the District and by channeling his energy into the purchase of the Baltimore Bullets in 1964. Emily Langer, Washington Post, "Irene Pollin, longtime co-owner of Washington Wizards, Capitals and Mystics, dies at 96," 1 Aug. 2020 Lang-Lessing has focused most of his energy since April on developing the VirtuMasterClass. Deborah Martin,, "Former San Antonio Symphony Music Director Sebastian Lang-Lessing’s new venture connects students with classical music stars," 31 July 2020 These curious twins are terrific pioneers, using their energy to spearhead innovative creative projects. Aliza Kelly Faragher, Allure, "The Personality of a Gemini, Explained," 31 July 2020 Your energy and enthusiasm are at a peak today, as are your charisma and charm., "Horoscope," 31 July 2020 All our energy is going toward helping find Naya and praying for her safe return and for her family. Rachel Yang,, "Amber Riley asks fans to 'focus' on Naya Rivera, other Glee alumni 'don't matter right now'," 13 July 2020 All our energy is going toward helping find Naya and praying for her safe return and for her family. Rachel Yang,, "Amber Riley asks fans to 'focus' on Naya Rivera, other Glee alumni 'don't matter right now'," 13 July 2020 At season’s end, everyone agreed that his energy and enthusiasm helped get the Irish back on track. Tom Noie, The Indianapolis Star, "Notre Dame basketball: Matt Doherty had a wild one season at coach," 12 July 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'energy.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of energy

1783, in the meaning defined at sense 1a

History and Etymology for energy

Late Latin energia, from Greek energeia activity, from energos active, from en in + ergon work — more at work

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Time Traveler for energy

Time Traveler

The first known use of energy was in 1783

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Statistics for energy

Last Updated

5 Aug 2020

Cite this Entry

“Energy.” Dictionary, Merriam-Webster, Accessed 8 Aug. 2020.

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More Definitions for energy


How to pronounce energy (audio)

English Language Learners Definition of energy

: ability to be active : the physical or mental strength that allows you to do things
: natural enthusiasm and effort
: usable power that comes from heat, electricity, etc.


en·​er·​gy | \ ˈe-nər-jē How to pronounce energy (audio) \
plural energies

Kids Definition of energy

1 : ability to be active : strength of body or mind to do things or to work The children … were tired and hardly had energy enough to walk.— E. B. White, Charlotte's Web
2 : strong action or effort He puts a lot of energy into his work.
3 : usable power or the resources (as oil) used to produce usable power Our new dryer uses a lot less energy.


en·​er·​gy | \ ˈen-ər-jē How to pronounce energy (audio) \
plural energies

Medical Definition of energy

2 : the capacity for doing work

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More from Merriam-Webster on energy

Thesaurus: All synonyms and antonyms for energy

Spanish Central: Translation of energy

Nglish: Translation of energy for Spanish Speakers

Britannica English: Translation of energy for Arabic Speakers

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