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fission, nuclear fission
1. The act of splitting or breaking apart.
2. In biology, the spontaneous division of a cell or organism into new cells or organisms; especially, as a mode of reproduction; cell division.
3. In physics, the disintegration of the nucleus of a heavy atom, leading to the formation of nuclei of more stable atoms and the release of energy.
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binary fission (s) (noun)
A form of asexual reproduction that involves the splitting of a parent cell into two approximately equal parts: "Binary fission involves the division of a single-celled organism into two daughter cells."
"Binary fission is a common form of asexual reproduction among bacteria, protozoa, and other unicellular organisms."
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The multiplication of ant colonies by splitting the worker force into two or more groups each of which depart with their own fertile queens.
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colony fission, sociotomy
The multiplication of colonies by the departure of one or more reproductive forms, accompanied by groups of workers, from the parental nest, leaving behind comparable units to perpetuate the "parental" colony.
This mode is referred to occasionally as hesmosis in ant literature and sociotomy in termite literature. Swarming in honey bees can be regarded as a special form of colony fission.