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Definition of Brownian motion noun from the Oxford Advanced Learner's Dictionary

Brownian motion

noun
 
/ˌbraʊniən ˈməʊʃn/
 
/ˌbraʊniən ˈməʊʃn/
[uncountable] (physics)
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  1. 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 Brownian motion in the Oxford Advanced American Dictionary
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