Main entry: substitution, commutation, exchange
Definition: the act of putting one thing or person in the place of another: "he sent Smith in for Jones but the substitution came too late to help"
Main entry: commutation, commuting
Definition: the travel of a commuter
Main entry: commutation, re-sentencing
Definition: (law) the reduction in severity of a punishment imposed by law
Main entry: commutation
Definition: a warrant substituting a lesser punishment for a greater one