Definition of commutation
noun [mass noun]
1the action or process of commuting a judicial sentence: a commutation of her sentence the conversion of a legal obligation or entitlement into another form, e.g. the replacement of an annuity or series of payments by a single payment: the commutation of dues into money rents making a one-off lump sum in commutation of your pension rights 2the process of commutating an electric current. 3 Mathematics the property of having a commutative relation.