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.
Etymology: L commutare commutat- (as COM-, mutare change)