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Definition of: commutation
(kom′yə·tā′shən) noun
1. A substitution of one kind of payment or service for another; also, the payment or service substituted.
2. Law A reduction or change of penalty.
3. Electr. The action of a commutator.
4. Daily or periodic travel on a commutation ticket. [<L commutatio, -onis <commutare change, alter <com- thoroughly + mutare change]
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