Etymology
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fission (n.)

1819, "division of a cell or organism," from Latin fissionem (nominative fissio) "a breaking up, cleaving," from past participle stem of findere "to split" (from PIE root *bheid- "to split"). Cognate with Old English bitan "to bite." Nuclear physics sense is 1939. As a verb, from 1929.

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Definitions of fission

fission (n.)
reproduction of some unicellular organisms by division of the cell into two more or less equal parts;
fission (n.)
a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy;
Synonyms: nuclear fission
From wordnet.princeton.edu