Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

English definition of “critical mass”

critical mass

noun [C usually singular or U]    
specialized physics the smallest amount of matter that is needed to produce a nuclear chain reaction Maximum and minimum the size that something needs to reach before a particular change , event , or development can happen Maximum and minimum
(Definition of critical mass noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of critical mass

Definitions of “critical mass” in other dictionaries

Translations of “critical mass”

Word of the Day

cookery

the skill or activity of preparing and cooking food

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