Usually means: Splitting of atomic nuclei, releases energy.
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We found 38 dictionaries that define the word fission:

General (25 matching dictionaries)
  1. fission: Merriam-Webster
  2. fission: Oxford Learner's Dictionaries
  3. fission: American Heritage Dictionary of the English Language
  4. fission: Collins English Dictionary
  5. fission: Vocabulary.com
  6. Fission, fission: Wordnik
  7. fission: Cambridge Advanced Learner's Dictionary
  8. fission: Wiktionary
  9. fission: Webster's New World College Dictionary, 4th Ed.
  10. fission: The Wordsmyth English Dictionary-Thesaurus
  11. fission: Infoplease Dictionary
  12. fission: Dictionary.com
  13. fission: Online Etymology Dictionary
  14. fission: Cambridge Essential American English Dictionary
  15. Fission (album), Fission (band), Fission (biology), Fission (disambiguation), Fission: Wikipedia, the Free Encyclopedia
  16. Fission: Online Plain Text English Dictionary
  17. fission: Webster's Revised Unabridged, 1913 Edition
  18. fission: Rhymezone
  19. Fission: AllWords.com Multi-Lingual Dictionary
  20. fission: FreeDictionary.org
  21. fission: Mnemonic Dictionary
  22. fission: TheFreeDictionary.com
  23. fission: Longman Dictionary of Contemporary English

Business (1 matching dictionary)
  1. fission: Legal dictionary

Computing (1 matching dictionary)
  1. fission: Encyclopedia

Medicine (4 matching dictionaries)
  1. fission: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. online medical dictionary (No longer online)
  4. fission: Medical dictionary

Science (6 matching dictionaries)
  1. Fission: Eric Weisstein's World of Physics
  2. Illustrated Glossary of Geologic Terms (No longer online)
  3. Fission: Extragalactic Astronomy
  4. Fission (fissioning): NRC Glossary of Nuclear Terms --
  5. fission: Natural History Terms
  6. FISSION: Zoom Astronomy Glossary

Tech (1 matching dictionary)
  1. Nuclear Terms (No longer online)

(Note: See fissional as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  The process whereby one item splits to become two.
noun:  (nuclear physics) nuclear fission: The process of splitting the nucleus of an atom into smaller particles.
noun:  (biology) The process by which a bacterium splits to form two daughter cells.
verb:  (transitive) To cause to undergo fission.
verb:  (intransitive) To undergo fission.

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