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Poisson distribution Syllabification: Pois·son dis·tri·bu·tion
Pronunciation: /pwäˈsän ˌdistrəˌbyo͞oSH(ə)n/

Definition of Poisson distribution in English:


A discrete frequency distribution that gives the probability of a number of independent events occurring in a fixed time.
Example sentences
  • In this he was the first to note that events with low frequency in a large population followed a Poisson distribution even when the probabilities of the events varied.
  • Because of the extreme non-normality of these scores, we used a statistical test for two Poisson distributions.
  • The Poisson distribution provides a statistical description of the number of enzymes in the droplet.


Named after the French mathematical physicist Siméon-Denis Poisson ( 1781–1840).

Definition of Poisson distribution in:
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