factorial
noun/fækˈtɔːriəl/
/fækˈtɔːriəl/
(mathematics)- the result when you multiply a whole number by all the numbers below it
- 5! (= factorial 5) is 120 (= 5 × 4 × 3 × 2 × 1).
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factorial
Definition of factorial noun from the Oxford Advanced Learner's Dictionary