of or pertaining to a factory.-related to factorials.-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.-the product of the consecutive numbers from unity up to any given number.