Fac*to"ri*al (?), a.
1.
Of or pertaining to a factory.
Buchanan.
2. Math.
Related to factorials.
© Webster 1913.
Fac*to"ri*al, n. Math. (a) pl.
A name given to the factors of a continued product when the former are derivable from one and the same function F(x) by successively imparting a constant increment or decrement h to the independent variable. Thus the product F(x).F(x + h).F(x + 2h) . . . F[x + (n-1)h] is called a factorial term, and its several factors take the name of factorials.
Brande & C.
(b)
The product of the consecutive numbers from unity up to any given number
.
© Webster 1913.