v. 1 intr. travel to and from one's daily work, usu. in a city, esp. by car or train. 2 tr. Law (usu. foll. by to) change (a judicial sentence etc.) to another less severe. 3 tr. (often foll. by into, for) a change (one kind of payment) for another. b make a payment etc. to change (an obligation etc.) for another. 4 tr. a exchange; interchange (two things). b change (to another thing). 5 tr. Electr. commutate. 6 intr. Math. have a commutative relation. 7 intr. US buy and use a season ticket.
[ L commutare commutat- (as COM-, mutare change) ]