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fis·sion

fission

 
pronunciation:
fI shn [or] fI zhn
features:
Word Combinations (noun), Word Explorer
part of speech: noun
definition: the splitting of the nucleus of an atom into two or more nuclei. This makes more atoms of lighter elements and gives off large amounts of energy.
antonyms:
fusion
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derivation: fissionable (adj.)
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  element