From HomoExcelsior

1. To travel as a commuter. 2. To make substitution or exchange. 3. To serve as a substitute. 4. To pay in gross, usually at a reduced rate, rather than in individual payments. 5. To satisfy or engage in a commutative operation. 6. To substitute (one thing for another); exchange. 7. To change (a penalty, debt, or payment) to a less severe one. 8. a 22-mile commute; an easy commute.

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