factorial Hear it!

factorial definition

fac·to·rial (fak tôr′ē əl)

adjective

  1. of a factor
  2. Math. of factors or factorials

noun

Math. the product of a given series of consecutive whole numbers beginning with 1 and ending with the specified number the factorial of 5 (5!) is 1 × 2 × 3 × 4 × 5, or 120

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