factorial

Short definition from Wiktionary

Noun

1. 1
   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.

Adjective

1. 1
   Of or pertaining to a factor or factorial.
2. 2
   Of or pertaining to a factor, a kind of business agent.
3. 3
   Of or pertaining to a factory.