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fission

fis·sion

fission

 
pronunciation:
fI shn [or] fI zhn
features:
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part of speech: noun
definition 1: the act or process or an instance of breaking apart.
antonyms:
fusion
definition 2: the splitting of an atomic nucleus into two or more nuclei, thus producing atoms of lighter elements and releasing large amounts of energy. (Cf. fusion.)
antonyms:
fusion
definition 3: in many one-celled organisms, reproduction by splitting into two genetically identical organisms.
derivation: fissionable (adj.)
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  element