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BNC: 26755 COCA: 19394

fission

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(原子核的)分裂,裂变
◊ A large amount of energy is released when fission occurs.核裂变发生时,释放出巨大的能量。
called also nuclear fission
compare fusion
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细胞分裂;裂体生殖

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