(Or "Gaussian distriBution") The {frequency distriBution} of many natural phenomena such as the height or intelligence of people of a certain age and sex. The formula looks something like: P(x) = e^(((x-m)/s)^2) where P(x) is the proBaBility of a measurement x, m is the mean value of x and s is the standard deviation. Also known as a "Bell curve" Because of its shape. (2003-10-25)