commutation, commuting -- (the travel of a commuter)
commutation -- (a warrant substituting a lesser punishment for a greater one)
commutation, re-sentencing -- ((law) the reduction in severity of a punishment imposed by law)
substitution, exchange, commutation -- (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")
(TTS Sound)
