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Definition of fission noun from the Oxford Advanced American Dictionary

     

    fission

     noun
    noun
    NAmE//ˈfɪʃn//
     
    [uncountable]
     
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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
  2. 2(biology) the division of cells into new cells as a method of reproducing cells
  3. 3(chemistry) the breaking of a chemical bond between two atoms
See fission in the Oxford Advanced Learner's Dictionary
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