[ 'fɪʃ(ə)n ]
■ noun
1》 division or splitting into parts.
2》 a reaction in which a heavy atomic nucleus splits in two, releasing much energy.
3》 Biology reproduction by means of a cell or organism dividing into two or more new cells or organisms.
■ verb (chiefly of atoms) undergo ~.
Derivatives
~able adjective
Origin
C17: from L. fissio(n-) , from findere 'to split'.