commuter

Concise Oxford English Dictionary © 2008 Oxford University Press:
commute/kəˈmjuːt/

▶verb

• 1 travel some distance between one's home and place of work on a regular basis.

• 2 reduce (a judicial sentence, especially a sentence of death) to a less severe one.

  ■ change one kind of payment or obligation for (another).

  ■ replace (an annuity or other series of payments) with a single payment.

• 3 Mathematics (of two operations or quantities) have a commutative relation.

– derivatives
commutable adjective,
commuter noun.

– origin ME: from L. commutare, from com- ‘altogether’ + mutare ‘to change’; sense 1 derives from commutation ticket, the US term for a season ticket (because the daily fare is commuted to a single payment).