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noun Factorial n. (Math.) (a)pl. 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. (b)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.
Collaborative International Dictionary of English 0.48
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