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The following 2 entries include the term poisson.
Poisson distribution
noun: a probability density function that is often used as a mathematical model of the number of outcomes obtained in a suitable interval of time and space, that has its mean equal to its variance, that is used as an approximation to the binomial distribution, and that has the form {latex}f(x) = \frac{e^{-\mu}\mu^{x}}{{x!}}{/latex} where μ is the mean and x takes on nonnegative integral values
poisson bleu
noun
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Merriam-Webster unabridged
