com·mute 
(kə-myt)
(kə-myt)v. com·mut·ed, com·mut·ing, com·mutes
v.intr.
1. To travel as a commuter: She commuted each day to her office downtown by subway.
2.
a. To make substitution or exchange.
b. To serve as a substitute.
3. To pay in gross, usually at a reduced rate, rather than in individual payments.
4. Mathematics & Logic To satisfy a commutative property. If a × b = b × a, then a commutes with b, regardless of whether the operation indicated by × is commutative.
v.tr.
1. To substitute (one thing for another); exchange.
2. To change (a penalty, debt, or payment) to a less severe one.
n.
An act or instance of commuting, especially the trip made by a commuter: a 22-mile commute; an easy commute.
[Middle English commuten, to transform, from Latin commūtāre : com-, com- + mūtāre, to change; see mei-1 in the Appendix of Indo-European roots.]