fission
noun
fis·sion
| \ ˈfi-shᵊn
, -zhᵊn\
, -zhᵊn\
Definition of fission
(Entry 1 of 2)
1
: a splitting or breaking up into parts
2
: reproduction by spontaneous division of the body into two or more parts each of which grows into a complete organism
3
: the splitting of an atomic nucleus resulting in the release of large amounts of energy
fission
verb
fissioned;
fissioning;
fissions
Definition of fission (Entry 2 of 2)
: to undergo fission
: to cause to undergo fission
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Other Words from fission
Noun
fissional
\ ˈfi-shə-nəl
, -zhə- \
adjective
, -zhə- \
adjective
Examples of fission in a Sentence
Recent Examples on the Web: Noun
Nuclear fission currently generates about 11 percent of electricity worldwide every year, and 20 percent in the United States. — National Geographic, "All spent nuclear fuel in the U.S. will soon end up in one place," 30 July 2019 The energy would be generated without the dangerous amounts of radiation that raises concerns about fission nuclear energy. — Nathanial Gronewold, Scientific American, "World’s Largest Nuclear Fusion Experiment Clears Milestone," 24 July 2019 To bump the cell’s efficiency higher, Baldo says, will require some engineering work to optimize it for exciton fission. — Daniel Oberhaus, WIRED, "New Designs Could Boost Solar Cells Beyond Their Limits," 11 July 2019 Measuring the radioactivity induced in the manganese would tell Fermi if the fissions were multiplying. — Richard Rhodes, New York Times, "A Remarkable Man Among Remarkable Men and Women," 24 Jan. 2018 One is fission reaction—the sort used in power stations. — The Economist, "An accident in Russia points to the risks of atomic aviation," 15 Aug. 2019 But this work was only meant as a proof of concept of exciton fission in a solar cell. — Daniel Oberhaus, WIRED, "New Designs Could Boost Solar Cells Beyond Their Limits," 11 July 2019 Fusion could deliver more energy more safely and with far less harmful radioactive waste than fission, but just a small number of people—including a 14-year-old from Arkansas—have managed to build working nuclear fusion reactors. — National Geographic, "What is nuclear energy and is it a viable resource?," 26 Mar. 2019 The authors conclude that advanced fission designs have no hope at all of commercializing in the US by mid-century, which is when the US economy needs to be decarbonized. — David Roberts, Vox, "The US is rapidly losing nuclear power. That’s profoundly concerning for climate change.," 11 July 2018Recent Examples on the Web: Verb
The point is that by analyzing the array of radioactive fission products – those that can be captured and analyzed – nuclear forensic specialists can start to figure out if the atoms that fissioned were U-235, Pu-239, or (in some cases) U-238. — Andrew Karam, Popular Mechanics, "Nuclear Forensics: How Scientists Can Tell Whether North Korea Is Lying About Its Bomb Test," 7 Jan. 2016 Anyone can see that fissioning uranium 235 or plutonium can be used to generate electricity. — Scientific American, "Readers Respond to the January 2018 Issue," 1 Jan. 2018These example sentences are selected automatically from various online news sources to reflect current usage of the word 'fission.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
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More Definitions for fission
fission
noun
English Language Learners Definition of fission
physics
: a process in which the nucleus of a heavy atom is split apart
biology
: a kind of reproduction in which a cell or body divides into two or more parts and each part grows into a whole new individual
See the full definition for fission in the English Language Learners Dictionary
fission
noun
fis·sion
| \ ˈfi-shən
\
\
Kids Definition of fission
1
: a method of reproduction in which a living cell or body divides into two or more parts each of which grows into a whole new individual
2
: the process of splitting an atomic nucleus with the release of large amounts of energy
fission
noun
fis·sion
| \ ˈfish-ən also ˈfizh-
\
\
Medical Definition of fission
1
: a method of reproduction in which a living cell or body divides into two or more parts each of which grows into a whole new individual
2a
: cleavage sense 2
b
: the splitting of an atomic nucleus resulting in the release of large amounts of energy
— called also nuclear fission
Other Words from fission
fission
verb
fissioned;
fissioning\ ˈfish-(ə-)niŋ also ˈfizh-
\
\
fissional
\ ˈfish-ən-ᵊl also ˈfizh-
\
adjective
\
adjective
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