Mile'age, n.

n. An allowance for traveling, as so much by the mile; especially, in the United States, an allowance made to members of Congress to defray the expenses of their journeys to and from Washington. [Written also, more analogically, but less frequently, mileage.]

Constructive mileage, a mileage allowed for journeys supposed to be made, but not actually made, from and to the seat of government, as at the adjournment of Congress, when a new president comes into office, and also when an extra session is called. [U. S.] Bartlett.