(Mathematics)the product of an integer and all the integers below it; e.g. factorial four (4!) is equal to 24(Symbol: !) (数)阶乘,析因(符号:!) ■the product of a series of factors in an arithmetical progression 阶乘积
adjective
(chiefly Mathematics)relating to a factor or such a product (主数)因子的;阶乘的,析因的 a factorial design. 因子设计,析因设计。