Definitions

1. adjective

relating to or denoting the random movement of particles suspended in a fluid (as in a gas or liquid) resulting from collisions with the surrounding particles.

“The brownian motion of pollen grains in water is a fascinating phenomenon to study.”

2. noun

a random movement of particles suspended in a fluid, resulting from collisions with the surrounding particles.

“The scientist observed the brownian motion of the particles in the solution.”