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   Brownian motion

   /ˌbraʊnɪən ˈməʊʃ(ə)n/

   noun

   • 1. the erratic random movement of microscopic particles in a fluid, as a result of continuous bombardment from molecules of the surrounding medium.

   Word Origin late 19th century: named after Robert Brown (1773–1858), the Scottish botanist who first observed the motion.

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