Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
 n. The product of all the positive integers from 1 to a given number: 4 factorial, usually written 4!, is equal to 24 (1 × 2 × 3 × 4 = 24).
 adj. Of or relating to a factor or factorial.
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. The result of multiplying a given number of consecutive integers from 1 to the given number. In equations, it is symbolized by an exclamation mark (!). For example, 5! = 1 * 2 * 3 * 4 * 5 = 120.
 adj. Of or pertaining to a factor or factorial.
 adj. Of or pertaining to a factor.
 adj. Of or pertaining to a factory.
from the GNU version of the Collaborative International Dictionary of English
 adj. Of or pertaining to a factory.
 adj. Related to factorials.
 n. 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.
 n. The product of the consecutive whole numbers from unity up to any given number.
from The Century Dictionary and Cyclopedia
 Pertaining to a factor or factory; constituting a factory.
 In mathematics, of or pertaining to a factor or factorials. See II.
 n. In mathematics, a continued product of the form Fx, F(x+1), F(x+2), F(x+3), … F(x+n), in which every factor after the first is derived from the preceding by increasing the variable by unity.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 n. the product of all the integers up to and including a given integer
 adj. of or relating to factorials
Etymologies
Sorry, no etymologies found.
Examples

AL CARDENAS, EMERGENCY ROOM PHYSICIAN: The types of injuries were multifactorial, that is, head injuries, orthopedic injuries, abdominal, intraabdominal injuries.

The results of these studies have led to what is called the factorial hypothesis of heredity, [45] according to which all the visible characters of the adult are produced by (purely hypothetical) factors in the germplasm; it is the factors that are inherited, and they, under proper conditions for development, produce the characters.

∗ The exclamation mark is called a factorial and represents the product of consecutive integers from 1 to the number before the factorial symbol.

The continuous product of the first 'n' natural numbers is called factorial n and is deonoted by n!

This pattern is called a factorial in mathematics.

= 1 The function int → int that gives n! on input n is called the factorial function n! is the number of permutations of n distinct objects There is just one permutation of one object.

 smp enable  sname factorial  mnesia debug verbose

this will call factorial on a string, matching it with the n pattern?

In [[mathematics]], the '' 'factorial' '' function

In [[mathematics]], the '' 'factorial' '' function gives the number of ways in which '' n '' labelled objects (for example the numbers from 1 to '' n '') can be arranged in order.
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