I have both nuclear power and nuclear energy. Also, I had the nuclear definition that you might wanted. I don't know which one you want, so I provide all of it that's related to nuclear.
Nuclear energy comes from the binding energy that is stored in the centre of an atom and holds it together. To release the energy, the atom has to be split into smaller atoms. This process is called fission.
Nuclear power is the use of nuclear reactions to produce electricity. Nuclear power can be obtained from nuclear fission, nuclear decay and nuclear fusion reactions.
Nuclear means relating to the nuclei of atoms, or to the energy released when these nuclei are split or combined. Also, nuclear can means relating to weapons that explode by using the energy released when the nuclei of atoms are split or combined.
