Meaning of factorial

fac•to•ri•al

Pronunciation: (fak-tôr'ē-ul, -tōr'-), [key]
— n.
  1. the product of a given positive integer multiplied by all lesser positive integers: The quantity four factorial (4!) = 4 &multiplydot; 3 &multiplydot; 2 &multiplydot; 1 = 24. Symbol: n!, where n is the given integer.
—adj.
  1. of or pertaining to factors or factorials.
  2. of or pertaining to a factor or a factory.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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