Mileage
Pronunciation : Mile"age (; 48)
Part of Speech : n.
Definition : 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.
Source : Webster's Unabridged Dictionary, 1913