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nuclear fusion

Nuclear fusion is when two or more lightweight atoms join together to form one heavier nucleus, with any energy released due to the conversion being converted into nuclear energy.

(noun)

An example of nuclear fusion is the process of four hydrogens coming together to form helium.

See nuclear fusion in Webster's New World College Dictionary

the fusion of lightweight atomic nuclei, as of tritium or deuterium, into a nucleus of heavier mass, as of helium, with a resultant loss in the combined mass, which is converted into energy: the principle of the hydrogen bomb

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