noun
: a probability function of the form f(x) = C(M, x) C(N - M, n - x) / C(N, n) where C(M, x) = M!/(x! (M - x)!) that gives the probability of obtaining exactly x elements of one kind and n-x elements of another if n elements are chosen at random without replacement from a finite population containing N elements of which M are of the first kind and N-M are of the second kind