Factorial

Definition of Factorial

Fac`to´ri`al
 a. 1 Of or pertaining to a factory. 2 (Math.) Related to factorials. n. 1 (Math.) 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. 2 The product of the consecutive whole numbers from unity up to any given number; thus, 5 factorial is the product of 5 times four times three times two times one, or 120.
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