Definition of fission noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈfɪʃn//
    ; NAmE NAmE//ˈfɪʃn//
    [uncountable] Energy and physical forces, Cell biology, The universe
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  1. 1 (also nuclear fission) (physics) the act or process of splitting the nucleus (= central part) of an atom, when a large amount of energy is released compare fusion Wordfinderamplitude, atom, energy, fission, force, frequency, gravity, molecule, nuclear, physics See related entries: Energy and physical forces, The universe
  2. 2 (biology) the division of cells into new cells as a method of reproducing cells See related entries: Cell biology
  3. Word Originearly 17th cent.: from Latin fissio(n-), from findere ‘to split’.
See the Oxford Advanced American Dictionary entry: fission

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