Meaning of FACTORIAL in English
adj related to factorials.
2. factorial ·adj of or pertaining to a factory.
3. factorial ·noun the product of the consecutive numbers from unity up to any given number.
4. factorial ·noun 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.
Webster English vocab. Английский словарь Webster. 2012