probability mass function

noun

A function that gives the relative probability that a discrete random variable is exactly equal to some value.

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Meanings

nounprobability mass function (plural probability mass functions)

plural probability mass functions · alternative initialism pmf

  1. mathematicsA function that gives the relative probability that a discrete random variable is exactly equal to some value.
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APA

probability mass function. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/probability%20mass%20function

MLA

“probability mass function.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/probability%20mass%20function. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “probability mass function,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/probability%20mass%20function.

Source: probability mass function on Wiktionary, CC BY-SA 4.0.