Dictionary

1factorial

adjective fac·to·ri·al \fak-ˈtr-ē-əl\

Definition of FACTORIAL

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

First Known Use of FACTORIAL

1837

2factorial

noun

Definition of FACTORIAL

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

1869

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