factorial

adjective
fac·to·ri·al | \ fak-ˈtȯr-ē-əl \

Definition of factorial 

(Entry 1 of 2)

: of, relating to, or being a factor or a factorial

factorial

noun

Definition of factorial (Entry 2 of 2)

1 : the product of all the positive integers from 1 to n symbol n!

2 : the quantity 0! arbitrarily defined as equal to 1

First Known Use of factorial

Adjective

1837, in the meaning defined above

Noun

1869, in the meaning defined at sense 1

History and Etymology for factorial

Adjective

factor entry 1 + -ial (in mathematical sense after French factoriel)

Noun

borrowed from French factorielle, noun derivative from feminine of factoriel factorial entry 1

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The first known use of factorial was in 1837

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