to travel back and forth regularly, esp between home and work
said of two mathematical operators: to give a commutative result
(usu + to) to exchange (a penalty) for another less severe
He had his death sentence commuted to life imprisonment
(often + into/for) to convert (e.g. a payment) into another form
commutable adj
commuter noun
[Latin commutare to change, exchange, from com- + mutare to change]