nuclear fission

fission ( def 2 ).

1885–90 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nuclear fission
Compare nuclear fusion Sometimes shortened to: fission the splitting of an atomic nucleus into approximately equal parts, either spontaneously or as a result of the impact of a particle usually with an associated release of energy

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Now a new study is underway to see if nuclear fission can be an alternative.
The nuclear fission process, which generates energy from uranium, does not
  produce harmful greenhouse emissions.
Transgenics is showing disturbing historical parallels to another problematic
  invention, nuclear fission.
Nuclear fission is not one of them, and is likely never to be one of them.
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