brownian movement(n = noun.phenomenon) brownian motion, pedesis - the random motion of small particles suspended in a gas or liquid; Array
is a kind of motion, movement

brownian movement, n. (also Brownian motion) Physics the erratic random movement of microscopic particles in a liquid, gas, etc., as a result of continuous bombardment from molecules of the surrounding medium.

Etymology:
R. Brown, Sc. botanist d. 1858

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