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).

Usage:

Symb.: ! (as in 4!).

2 the product of a series of factors in an arithmetical progression.

--adj. of a factor or factorial.

Derivatives:

factorially adv.

Oxford English vocab.      Оксфордский английский словарь.