1

factorial

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

Definition of factorial

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

First Known Use of factorial

1837


2

factorial

noun fac·to·ri·al

Definition of factorial

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

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

First Known Use of factorial

1869


Learn More about factorial


Seen and Heard

What made you want to look up factorial? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

an extremely thin woman

Get Word of the Day daily email!

Test Your Vocabulary

Time Traveler Quiz: Which Word Came First?

  • time-traveler-quiz-which-word-came-first
  • Which came first?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!