1. Change; alteration; a passing from one state to another.
2. Exchange; the act of giving one thing for another; barter.
The use of money is to save the commutation of more bulky commodities.
3. In law, the change of a penalty or punishment from a greater to a less; as banishment instead of death.
Suits are allowable in the spiritual courts for money agreed to be given as a commutation for penance.