factorials

[fak-tawr-ee-uhl, -tohr-]

fac·to·ri·al

[fak-tawr-ee-uhl, -tohr-]
noun
1.
Mathematics. the product of a given positive integer multiplied by all lesser positive integers: The quantity four factorial (4!) = 4 ⋅ 3 ⋅ 2 ⋅ 1 = 24. Symbol: n!, where n is the given integer.
adjective
2.
Mathematics. of or pertaining to factors or factorials.
3.
of or pertaining to a factor or a factory.

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Factorials is always a great word to know.
So is flibbertigibbet. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a chattering or flighty, light-headed person.

Origin:
1810–20; factor + -ial

fac·to·ri·al·ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source Link To factorials
American Heritage
Science Dictionary
factorial   (fāk-tôr'ē-əl)  Pronunciation Key 
The product of all of the positive integers from 1 to a given positive integer. It is written as the given integer followed by an exclamation point. For example, the factorial of 4 (written 4!) is 1 × 2 × 3 × 4, or 24.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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