factorial

名词 factorial:

1. the product of all the integers up to and including a given integer

形容词 factorial:

1. of or relating to factorials

fac.to.ri.al

n.（名词）
The product of all the positive integers from to a given number:
阶乘：从到所给数字中的所有正数相乘：
例句：
4 factorial, usually written 4!, is equal to 24 ( × 2 × 3 × 4 = 24).
4的阶乘，常写作4！，等于24（×2×3×4＝24）

adj.（形容词）
Of or relating to a factor or factorial.
因数或阶乘的：因数或阶乘的，与因数或阶乘有关的