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fission

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fission/ˈfɪʃn̩/noun
fission
/ˈfɪʃn̩/
noun
Learner's definition of FISSION  
[noncount]
physics  : a process in which the nucleus of a heavy atom is split apart
◊ A large amount of energy is released when fission occurs.
— compare fusion
— called also nuclear fission
biology  : a kind of reproduction in which a cell or body divides into two or more parts and each part grows into a whole new individual
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