1. (v. t.) To interchange; to exchange; to diminish; to substitute; as, to commute a death sentence to one of life imprisonment\; to commute tithes; to commute charges for fares.
2. (v. i.) To obtain or bargain for exemption or substitution; to effect a commutation.
3. (v. i.) To pay, or arrange to pay, in gross instead of part by part; as, to commute for a year's travel over a route.