v. To exchange; to put or substitute something else in place of, as a smaller penalty, obligation, or payment, for a greater, or a single thing for an aggregate; hence, to lessen; to diminish.verb-intransitive. To obtain or bargain for exemption or substitution; to effect a commutation.verb-intransitive. To pay, or arrange to pay, in gross instead of part by part.verb-intransitive. to travel regularly from a place of residence to another place, such as where one's daily work is performed. Often, such travel is performed between a suburb and a nearby city.