Origin: Latin suffix -tion
Poisson distribution has 2 different meanings across 1 category:
a theoretical distribution that is a good approximation to the binomial distribution when the probability is small and the number of trials is large
Any of a class of discrete probability distributions that express the probability of a given number of events occurring in a fixed time interval, where the events occur independently and at a constant average rate; describable as a limit case of either binomial or negative binomial distributions.