factorial Meaning, Definition & Usage

  1. noun the product of all the integers up to and including a given integer
    • 1, 2, 6, 24, and 120 are factorials
  2. adjective of or relating to factorials

WordNet

Fac*to"ri*al adjective
Definitions
  1. Of or pertaining to a factory. Buchanan.
  2. (Math.) Related to factorials.
Fac*to"ri*al noun
Definitions
  1. (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. Brande & C. (b) The product of the consecutive numbers from unity up to any given number.

Webster 1913