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  1. Oxford American Dictionary

    nuclear fission

    • IPA[ˈn(y)o͞okli(ə)r]

    美式

    • n.
      a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy.

    • noun: nuclear fission

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    nuclear fission

    英式

    • n.
      a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another ...

    Oxford Dictionary