Webster's English Dictionary

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commutation

com.mu.ta.tion \.ka:m-y*-'ta--sh*n\ n [ME, fr. MF, fr. L commutation-, 
   commutatio, fr. commutatus,]pp. of commutare 1: EXCHANGE, TRADE  2: 
   REPLACEMENT; specif : a substitution of one form of paymen t or charge for 
   another 3: a change of a legal penalty or punishment to a lesser one  4: an 
   act of commuting  5: the action of commutating