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factorial

noun
🔊/fækˈtɔːriəl/
🔊/fækˈtɔːriəl/
 (mathematics数学)
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  1. the result when you multiply a whole number by all the numbers below it阶乘
    • 5! (= factorial 5) is 120 (= 5 × 4 × 3 × 2 × 1).5!（5 的阶乘）为 120（即 5 × 4 × 3 × 2 × 1）。
    Topics Maths and measurementc2