Definition of Brownian motion noun from the Oxford Advanced American Dictionary

 

Brownian motion

 noun
noun
NAmE//ˌbraʊniən ˈmoʊʃn//
 
[uncountable](physics)
 
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the movement without any regular pattern made by very small pieces of matter in a liquid or gas This slide shows how Brownian motion appears through a microscope. The mathematics behind Brownian motion was applied to stock market fluctuations.
See the Oxford Advanced Learner's Dictionary entry: Brownian motion