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English definition of “fission”

fission

noun [U]     /ˈfɪʃ.ən/
specialized physics the process of dividing the nucleus of an atom, which results in the release of a large amount of energy : nuclear fissionCellsPhysical and chemical processes specialized biology the division of a living cell as part of reproduction: The fission of the cell could be inhibited with certain chemicals.
(Definition of fission noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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