/ Dictionary / Index P probability curve: Meaning and Definition of Find definitions for: probabil'ity curve" Pronunciation: [key] — Statistics. Statistics. a curve that describes the distribution of probability over the values of a random variable. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. probability probability density function Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language