nuclear energy
Americannoun
noun
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The energy released by the nucleus of an atom as the result of nuclear fission, nuclear fusion, or radioactive decay. The amount of energy released by the nuclear fission of a given mass of uranium is about 2,500,000 times greater than that released by the combustion of an equal mass of carbon. And the amount of energy released by the nuclear fusion of a given mass of deuterium is about 400 times greater that that released by the nuclear fission of an equal mass of uranium.
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Also called atomic energy
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Electricity generated by a nuclear reactor.
Pronunciation
See nuclear ( def. ).
Etymology
Origin of nuclear energy
First recorded in 1925–30
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Roughly 50 companies are working on the small reactors, mostly in the U.S., said Adam Stein, director of nuclear energy and innovation at the Breakthrough Institute.
From Los Angeles Times ● Aug. 28, 2026
In discussions with peers, he has likened the proposed entity to the International Atomic Energy Agency, a nongovernmental watchdog that promotes cooperation on nuclear energy.
From The Wall Street Journal ● Aug. 13, 2026
Ian Chun, senior research analyst at Sands Capital with $56 billion under management, commented that industrial companies in Korea were set to benefit from the build-out of power infrastructure, grid modernization and nuclear energy.
From MarketWatch ● Aug. 13, 2026
Transitions between nuclear energy states are described as either electric or magnetic.
From Science Daily ● Jul. 31, 2026
But Dad’s main interest was energy: thermal energy, nuclear energy, solar energy, electrical energy, and energy from the wind.
From "The Glass Castle" by Jeannette Walls
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
