mileage

Mile"age (; 48), n. 1. An allowance for traveling expenses at a certain rate per mile. 2. Aggregate length or distance in miles; esp., the sum of lengths of tracks or wires of a railroad company, telegraph company, etc. [Written also milage.] Constructive mileage, a mileage allowed for journeys supposed to be made, but not actually made. Bartlett.

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