What is the meaning of Commutation?

Substitution of one thing for another; interchange.

Specifically, the substitution of one kind of payment for another, especially a switch to monetary payment from obligations of labour.

The change to a lesser penalty or punishment by the State

Substitution, as a means of discriminating between phonemes.

The reversal of an electric current.

A passing from one state to another; change; alteration; mutation.

The act of giving one thing for another; barter; exchange.

The process or habit of journeying to and from work on a regular basis; commuting.

commutation

Source: wiktionary.org