单词	noncommutative
释义	noncommutative adjective non·​com·​mu·​ta·​tive ˌnän-kə-ˈmyü-tə-tiv  -ˈkäm-yə-ˌtā-tiv mathematics : of, relating to, having, or being the property that a given mathematical operation and set have when the result obtained using any two elements of the set with the operation differs with the order in which the elements are used : not commutative Subtraction is a noncommutative operation. noncommutativity ˌnän-kə-ˌmyü-tə-ˈti-və-tē  -ˌkäm-yə-tə- noun Word History First Known Use 1846, in the meaning defined above
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