nuclear energy

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The energy released by a nuclear reaction, especially by fission or fusion.
• noun Nuclear energy regarded as a source of power.

from the GNU version of the Collaborative International Dictionary of English.

• noun Energy derived from nuclear reactions; -- used at present especially of electrical power generated in atomic reactors, but encompassing also fusion energy.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun physics the energy released by a nuclear reaction; either through nuclear fission or nuclear fusion
• noun such energy used as a power source

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the energy released by a nuclear reaction