Factorial

Pronunciation

• IPA: /fækˈtɔːɹiÉ™l/

Full definition of factorial

Noun

1. (mathematics, combinatorics) 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.

Usage notes

"n!" is read as "factorial of n" or "n factorial."

Related terms

• fact
• faction
• factor
• factory
• fashion

Adjective

1. (mathematics) Of or pertaining to a factor or factorial.
2. Of or pertaining to a factor.
3. (dated) Of or pertaining to a factory.