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Definition of Fission
1. Noun. Reproduction of some unicellular organisms by division of the cell into two more or less equal parts.
2. Noun. A nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy.
Definition of Fission
1. n. A cleaving, splitting, or breaking up into parts.
Definition of Fission
1. to split into parts [v -ED, -ING, -S]
Medical Definition of Fission
1. A type of cell division in which overall (i.e., not localised) cell growth is followed by septum formation which typically divides the fully grown cell into two similar or identical cells. (09 Oct 1997)