com·mu·ta·tive
adjective/kəˈmjuːtətɪv/
/kəˈmjuːtətɪv/
(mathematics)- (of a calculation) giving the same result whatever the order in which the quantities are shown
交换的（排列次序不影响结果） 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’.