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fissionMain Entry: fis·sion Pronunciation: \ˈfish-ən also ˈfizh-\ Function: noun 1 : a method of reproduction in which a living cell or body divides into two or more parts each of which grows into a whole new individual 2 a : cleavage 2 b : the splitting of an atomic nucleus resulting in the release of large amounts of energy—called also nuclear fission —fis·sion verb, fis·sioned; fis·sion·ing \ˈfish-(ə-)niŋ also ˈfizh-\ —fis·sion·al \ˈfish-ən-əl also ˈfizh-\ adjective
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