Definition of fission in English:

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Pronunciation: /ˈfiSHən/


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.
splitting, division, dividing, rupture, breaking, severance
1.1 short for nuclear fission.
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.


[no object]
(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.


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

Words that rhyme with fission

academician, addition, aesthetician (US esthetician), ambition, audition, beautician, clinician, coition, cosmetician, diagnostician, dialectician, dietitian, Domitian, edition, electrician, emission, fruition, Hermitian, ignition, linguistician, logician, magician, mathematician, Mauritian, mechanician, metaphysician, mission, monition, mortician, munition, musician, obstetrician, omission, optician, paediatrician (US pediatrician), patrician, petition, Phoenician, physician, politician, position, rhetorician, sedition, statistician, suspicion, tactician, technician, theoretician, Titian, tuition, volition

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Syllabification: fis·sion

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