English to English adjective
1 
of or relating to factorials   source: wordnet30
2 
Of or pertaining to a factory.   source: webster1913
noun
3 
the product of all the integers up to and including a given integer   Example: 1, 2, 6, 24, and 120 are factorials
source: wordnet30
4 
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 + (n1)h] is called a factorial term, and its several factors take the name of factorials.   source: webster1913
