Definition of: mileage

(mī′lij) noun
1. The entire length or amount of anything that is or may be measured in miles, especially when stated in miles; aggregate number of miles of track, wire, etc., traversed, made, or used.
2. Compensation reckoned at so much a mile, allowed in lieu of expenses of travel.
3. The rate a mile paid by one traveling in a car, or using a car for any purpose.
4. Number of miles traveled by an automobile, etc., as estimated for each gallon of fuel used.
5. Length of service, quality of performance, etc.; use. Also spelled milage.