Medical Definition of BROWNIAN MOTION. : a random movement of microscopic particles suspended in liquids or gases resulting from the impact of molecules of the fluid surrounding the particlesâcalled also Brownian movement.edical Definition of BROWNIAN MOTION. : a random movement of microscopic particles suspended in liquids or gases resulting from the impact of molecules of the fluid surrounding the particlesâcalled also Brownian movement.
The Fresh Prince of Bel-Air is an American sitcom that originally aired on NBC from September 10, 1990, to May 20, 1996.
Will Smith and Janet Hubert on 'The Fresh Prince of Bel-Air.' Chris Cuffaio/NBCU Photo Bank via Getty Images. According to the actress, Smith's age (at the time, he was 25) had something to do with it.