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抽象代數中,冪結合性是弱結合律

如果由任意元素所產生的次代數符合結合律,這個代數就是擁有冪結合性。元素x能夠多次自乘並不在乎到達了什麼冪數。例如x(x(xx)) = (x(xx))x = (xx)(xx). 以下結合律方式更為強烈:

代數中每個x,

每個結合性的代數都明顯地擁有冪結合性,一些交錯代數(例如八元數)甚至是一些非交錯代數(例如十六元數)亦如此。

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