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Synonyms
com·mu·ta·tion (kŏḿyə-tā́shən)

[Middle English commutacioun, from Latin commūtātiō, commūtātiōn-, from commūtātus past participle of commūtāre, to alter, exchange; see commute.]

noun 

  1. A substitution, exchange, or interchange.
    1. The substitution of one kind of payment for another.
    2. The payment substituted.
  3. The travel of a commuter.
  4. Electricity
    1. Conversion of alternating to unidirectional current.
    2. Reversal of current direction.
  5. Law Reduction of a penalty to a less severe one.