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fission the splitting of the nucleus of an atom into two or more nuclei. This makes more atoms of lighter elements and gives off large amounts of energy.
fusion a reaction that combines the nuclei of atoms to form heavier nuclei. A huge amount of energy is released during nuclear fusion. [1/4 definitions]
nuclear using the nuclei of atoms. [1/3 definitions]
nuclear energy energy released from the nuclei of atoms, either by splitting or by fusing them.