Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “fission”

fission

noun [U] uk   /ˈfɪʃ.ən/ us  
specialized physics the process of dividing the nucleus of an atom, which results in the release of a large amount of energy : nuclear fissionCellsPhysical and chemical processes specialized biology the division of a living cell as part of reproduction: The fission of the cell could be inhibited with certain chemicals.
(Definition of fission from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of fission?
Add Cambridge dictionaries to your browser to your website

More meanings of “fission”

Definitions of “fission” in other dictionaries

Word of the Day

scrumpy

an alcoholic drink made from apples

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More