commutation (Noun) — The travel of a commuter.
commutation (Noun) — (law) a warrant substituting a lesser punishment for a greater one.
commutation (Noun) — (law) the reduction in severity of a punishment imposed by law.
commutation (Noun) — The act of putting one thing or person in the place of another. ex. "he sent Smith in for Jones but the commutation came too late to help"