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commutative (adj.)

"relating to exchange, interchangeable, mutual," 1530s, from Medieval Latin commutativus, from Latin commutat-, past participle stem of commutare (see commute (v.)). Commutative justice regulates interactions between two persons. Related: Commutatively.

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Definitions of commutative from WordNet

commutative (adj.)
(of a binary operation) independent of order; as in e.g. "a x b = b x a";
From wordnet.princeton.edu