non-commutative
/ˌnɒnkəˈmjuːtətɪv/ /ˌnɒnˈkɒmjʊtətɪv/ /ˌnɒnˈkɒmjʊteɪtɪv/Mathematics
adjective
Not obeying the commutative law; (of a binary operation) giving a result that depends on the order of the quantities involved.
Origin
Mid 19th century; earliest use found in Proceedings of the Royal Society of London. From non- + commutative.