nuclear power

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

• noun Power, especially electricity, the source of which is nuclear fission.
• noun A nation or group possessing nuclear weapons.

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

• noun Power derived from nuclear reactions; -- used at present especially of electrical power generated in atomic reactors, but encompassing also fusion power.
• noun A country possessing nuclear weapons.

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

• noun uncountable Power, especially electrical power, obtained using nuclear fission or nuclear fusion
• noun countable A nation that possesses nuclear weapons

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

• noun nuclear energy regarded as a source of electricity for the power grid (for civilian use)