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Fission is a splitting of something into two or more parts.

Fission may refer to:

  • Fission (biology), the subdivision of a cell or multi-cellular body into one or more parts and the regeneration of each part into a complete individual.
  • Nuclear fission, where a large atomic nucleus (such as that of uranium) is split into two (or sometimes more) smaller nuclei.
  • Another name for secession, the process whereby a nation-state divides into multiple states.

Other uses[edit]