mile·age / ˈmīlij/ (also mil·age) • n. 1. [usu. in sing.] a number of miles traveled or covered: the car is in good condition, considering its mileage. ∎ [usu. as adj.] traveling expenses paid according to the number of miles traveled: the mileage rate will be 34 cents per mile.2. inf. the contribution made by something to one's aims or interests: he was getting a lot of mileage out of the mix-up. ∎ the likely potential of someone or something: there is bound to be a lot of mileage for the paperback.