Fission is a splitting of something into its parts.

Fission may refer to:

• In physics, nuclear fission is a process where a large atomic nucleus (such as uranium) is split into two smaller nuclei
• In biology, binary fission is the mitosis process whereby a prokaryote reproduces by cell division
• In anthropology, fission is the process whereby a nation-state divides and becomes multiple states
• In geology, fissility is the property of mudstones to split along layers

Other uses:

• Fission (band), a Swedish melodic death metal band

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