Definitions for nuclear fusion
fusion, nuclear fusion, nuclear fusion reaction(noun)
a nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy
The combining of the nuclei of small atoms to form the nuclei of larger ones, with a resulting release of large quantities of energy; the process that makes the sun shine, and hydrogen bomb explode.
U.S. National Library of Medicine
Thermonuclear reaction in which the nuclei of an element of low atomic weight unite under extremely high temperature and pressure to form a nucleus of a heavier atom.
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