associative
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Associative -- from MathWorld

Three elements x, y and z of a set S are said to be associative under a binary operation * if they satisfy x*(y*z) = (x*y)*z.
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Associativity - Wikipedia, the free encyclopedia
... Put another way, no parentheses are required for an associative operation. Consider for instance the equation ... We say that "addition of real numbers is an associative operation". ...
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