nuclear fission

noun
fission ( def 2 ).

Origin:
1885–90

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World English Dictionary
nuclear fission
 
n
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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Cite This Source
00:10
Nuclear fission is always a great word to know.
So is quincunx. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Example sentences
Xenon is a surefire element that is present if nuclear fission has occurred.
All nuclear warheads contain conventional chemical explosives as well as
  nuclear fission fuel.
We also make it extremely difficult to develop the cleanest viable energy
  technology currently available: nuclear fission.
Nuclear fission is not one of them, and is likely never to be one of them.
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