Definition of fission in English:

fission

Syllabification: fis·sion
Pronunciation: /ˈfiSHən, ˈfiZHən
 
/

noun

  • 1The action of dividing or splitting something into two or more parts: the party dissolved into fission and acrimony
    More example sentences
    • We hope that further experimental studies will reveal fission and fusion promotion processes in real systems.
    • Several of these new departments have been reorganised on a number of occasions to accommodate shifting trends in policy, through what might be referred to as a process of fission and fusion.
    • In the current wave, processes of fission and disintegration predominate.
    Synonyms
    splitting, division, dividing, rupture, breaking, severance
  • 1.1 short for nuclear fission.
    More example sentences
    • Uranium fission plants in the US are presently supplying less than 8% of our total energy demand.
    • It produces no fission radioactive by-products or fallout of serious concern.
    • These fission products are not found in natural background radiation, but are exclusively byproducts of nuclear weapons explosions and nuclear reactor operations.
  • 1.2 Biology Reproduction by means of a cell or organism dividing into two or more new cells or organisms: bacteria divide by transverse binary fission
    More example sentences
    • We considered a model in which the proliferating cells divide by binary fission.
    • Primarily they reproduce asexually, which they accomplish by binary fission, or simple cell division.
    • Bacteria divide symmetrically during normal growth and have a central constriction to bring about binary fission of the cell.

verb

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  • (Chiefly of atoms) undergo fission: these heavy nuclei can also fission
    More example sentences
    • One of the differences between U235 and its common relative U238 is that U235 fissions very easily.
    • We will assume that once a seed has fissioned once, it continues to fission or effectively double in a time t 2, which is independent of the above distribution.
    • Most of the transuranium elements have isotopes that disintegrate by fissioning in addition to emitting alpha particles.

Origin

early 17th century: from Latin fissio(n-), from findere 'to split'.

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