factorial: Meaning and Definition of

fac•to•ri•al

1. the product of a given positive integer multiplied by all lesser positive integers: The quantity four factorial (4!) = 4 &multiplydot; 3 &multiplydot; 2 &multiplydot; 1 = 24. Symbol: n!, where n is the given integer.

1. of or pertaining to factors or factorials.
2. of or pertaining to a factor or a factory.