Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “fission”

See all translations

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 fission specialized biology the division of a living cell as part of reproduction: The fission of the cell could be inhibited with certain chemicals.
Translations of “fission”
in Spanish fisión…
in French fission…
in German die Spaltung…
in Chinese (Traditional) (核)裂變,分裂, 細胞分裂, 裂殖…
in Chinese (Simplified) (核)裂变,分裂, 细胞分裂, 裂殖…
(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

Definitions of “fission” in other dictionaries

Word of the Day

make believe

believing or imagining things that appear to be attractive or exciting, but are not real

Word of the Day

Lies, lies, lies!

by Kate Woodford,
February 25, 2015
​​​ According to sociologists (=people who study the relationships between people living in groups), we are good at lying. As a species, we have developed a remarkable ability to deceive each other (= persuade each other that something false is true). Being able to say things that are not true can help with

Read More 

showrooming noun

February 23, 2015
the activity of examining a product in a physical store and then making the purchase with an online retailer Amazon’s new smartphone is specifically designed to make showrooming fast and easy.

Read More