Meaning of FACTORIAL in English

FACTORIAL

n. & adj. Math.

n. 1 the product of a number and all the whole numbers below it (factorial four = 4 x 3 x 2 x 1). °Symb.: ! (as in 4!). 2 the product of a series of factors in an arithmetical progression.

adj. of a factor or factorial. factorially adv.

Concise Oxford English dictionary.      Краткий оксфордский словарь английского языка.