Meaning of FACTORIAL in English

FACTORIAL

[fac.to.ri.al] adj (1837): of, relating to, or being a factor or a factorial

[2]factorial n (1869) 1: the product of all the positive integers from 1 to n--symbol n]

2: the quantity 0] arbitrarily defined as equal to 1

Merriam-Webster English vocab.      Английский словарь Merriam Webster.