- Fission is defined as the action of dividing into two or more parts.
- When everyone in your club disagrees on a fundamental issue and you all split up and three separate new clubs are formed, this is an example of fission.
- When the nuclei of atoms divide into two parts and there is energy created by the split, this is an example of fission.
- a splitting apart; division into parts
- nuclear fission
- Biol. a form of asexual reproduction, found in various simple plants and animals, in which the parent organism divides into two or more approximately equal parts, each becoming an independent individual
Origin of fissionClassical Latin fissio ; from fissus, past participle of findere, to cleave, split ; from Indo-European base an unverified form bheid-, to split from source bite
- The act or process of splitting into parts.
- A nuclear reaction in which an atomic nucleus, especially a heavy nucleus, such as an isotope of uranium, splits into fragments, usually two fragments of comparable but unequal mass, and releases a few neutrons and about 100 million electron volts of energy. Nuclear fission may occur spontaneously or may be induced by the absorption of a neutron, which can initiate a nuclear chain reaction.
- Biology An asexual reproductive process in which a unicellular organism divides into two or more independently maturing daughter cells.
verbfis·sioned, fis·sion·ing, fis·sions
Origin of fissionLatin fissiō, fissiōn-, a cleaving, from fissus, split; see fissi–.
fission of a uranium nucleus
(countable and uncountable, plural fissions)
- (process of splitting the nucleus of an atom): fusion
(third-person singular simple present fissions, present participle fissioning, simple past and past participle fissioned)
- To cause to undergo fission.
- (intransitive) To undergo fission.
From Latin fissiōnem, accusative singular of fissiō (“the act of breaking up”), from findō (“split, divide”).