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Noun
                                                
                        
                            Poisson distribution
                        
                                                
                                                    
                
                    
                    Definition: a theoretical distribution that is a good approximation to the binomial distribution when the probability is small and the number of trials is large
Definition: 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.