Meaning of FACTORIAL in English

FACTORIAL

I. adjective Date: 1837 of, relating to, or being a factor or a ~, II. noun Date: 1869 the product of all the positive integers from 1 to n , the quantity 0! arbitrarily defined as equal to 1

Merriam Webster. Explanatory English dictionary Merriam Webster.      Толковый словарь английского языка Мерриам-Уэбстер.