1. (of a calculation) giving the same result whatever the order in which the quantities are shown
   Word Originmid 16th cent. (in the sense ‘relating to transactions between people’): from French commutatif, -ive or medieval Latin commutativus, from commutat- ‘exchanged’, from the verb commutare from com- ‘altogether’ + mutare ‘to change’.

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[TahlilGaran] English Dictionary ▲