nuclear fusion

WordReference Random House Unabridged Dictionary of American English © 2026

nu′clear fu′sion, 

1. Physics fusion (def. 4).

• 1895–1900

Collins Concise English Dictionary © HarperCollins Publishers::

nuclear fusion noun

1. a reaction in which two nuclei combine to form a nucleus with the release of energy
   Sometimes shortened to: fusion
   Compare nuclear fission
   See also thermonuclear reaction