probability density function

WordReference Random House Unabridged Dictionary of American English © 2025

probabil′ity den′sity func′tion, [Statistics.]

1. Statistics a function of a continuous variable whose integral over a region gives the probability that a random variable falls within the region.
2. Statistics Also called frequency function. a function of a discrete variable whose sum over a discrete set gives the probability of occurrence of a specified value.

• 1935–40