The property or capacity of a substance to undergo fission, especially nuclear fission that releases large amounts of energy.
From fissionable + -ity; fissionable comes from fission (from Latin 'fissio') + -able (able to); a 20th-century scientific coinage.
Fissionability is perhaps the most consequential scientific property discovered in the modern era—it literally powered the nuclear age and changed geopolitics forever!
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