the product of all the positive integers from one up to and including a given integer. Factorial zero is assigned the value of one: factorial four is 1 × 2 × 3 × 4. Symbol: n!, where n is the given integer
adjective
2.
of or involving factorials or factors
Derived forms
factorially (facˈtorially)
adverb
factorial in American English
(fækˈtɔriəl)
adjective
1.
of a factor
2. Ancient Mathematics
of factors or factorials
noun
3. Ancient Mathematics
the product of a given series of consecutive whole numbers beginning with 1 and ending with the specified number
the factorial of 5 (5!) is 1 × 2 × 3 × 4 × 5, or 120