nuclear fusion

fusion ( def 4 ).

1895–1900 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nuclear fusion
Compare nuclear fission See also thermonuclear reaction Sometimes shortened to: fusion a reaction in which two nuclei combine to form a nucleus with the release of energy

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
But the model stops short of simulating the moment the protostar achieves full
  nuclear fusion and transforms into a true star.
After such an explosion blows a star's outer layers into space, the core
  remains-but it no longer produces nuclear fusion.
Eventually, temperature and pressure within the clumps rise high enough to
  ignite nuclear fusion-and a star is born.
Deep in the sun's core, nuclear fusion reactions convert hydrogen to helium,
  which generates energy.
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