AskDefine | Define fission

Dictionary Definition



1 a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy [syn: nuclear fission]
2 reproduction of some unicellular organisms by division of the cell into two more or less equal parts

User Contributed Dictionary




  1. The process whereby one item splits to become two.
  2. The process of splitting an atom into smaller particles.
  3. The process by which a bacterium splits to form two daughter cells.


process whereby one item splits to become two
process of splitting an atom
process by which a bacterium splits into two


  1. To cause to fission.
  2. To undergo fission.




Extensive Definition

Fission is a splitting of something into its parts.
Fission may refer to:
  • In physics, nuclear fission is a process where a large atomic nucleus (such as uranium) is split into two smaller nuclei
  • In biology, binary fission is the mitosis process whereby a prokaryote reproduces by cell division
  • In anthropology, fission is the process whereby a nation-state divides and becomes multiple states
  • In geology, fissility is the property of mudstones to split along layers
Other uses:
fission in Danish: Fission (flertydig)
fission in Swedish: Fission
fission in Lithuanian: Skilimas

Synonyms, Antonyms and Related Words

ablate, abscission, accelerate, activate, alpha decay, amputation, atom-chipping, atom-smashing, atomic disintegration, atomic reaction, atomization, atomize, beta decay, bifurcate, bisect, bombard, bombardment, branch, break into pieces, break to pieces, break up, breeding, bullet, butchering, by two, catalysis, catalyst, chain reaction, chopping, cleavage, cleave, come apart, consume, corrode, crack up, crash, cross-bombard, crumble, crumble into dust, crunch, crush, cut in two, cut to pieces, cutting, decay, decompose, demolish, dialysis, dichotomize, dichotomy, diffuse, dimidiate, disintegrate, disintegration series, disjoin, disorganize, disperse, disrupt, dissociation, dissolve, divide, enucleation, erode, exchange reaction, excision, fall to pieces, fission reaction, fork, fragment, gamma decay, grind, halve, hydrolysis, hydrolyst, in half, ionization, laceration, make mincemeat of, mince, molder, mutilation, neutron reaction, nonreversible reaction, nuclear fission, nucleization, nucleize, photodisintegration, photolysis, proton gun, proton reaction, pulverize, ramify, rending, resection, reversible reaction, ripping, scatter, scission, section, severance, shatter, shiver, slashing, slicing, smash, smash the atom, smash up, splinter, split, split in two, splitting, splitting the atom, squash, squish, stimulation, subdivide, surgery, target, tearing, thermolysis, thermonuclear reaction, transect, waste away, wear away
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