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 fission fission /ˈfɪʃən/

noun

  1. A nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy  ( fission , nuclear fission )
    a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy
  2. Reproduction of some unicellular organisms by division of the cell into two more or less equal parts  ( fission )
    reproduction of some unicellular organisms by division of the cell into two more or less equal parts