Of an establishment, providing service to occupants of automobiles while they are in their still-running vehicle, especially when the vehicle does not park in a parking space and the goods received are not consumed until the vehicle vacates the lane.
I switched banks so that I could use a drive-through branch near my home.
2
Of a feature of such an establishment (especially a window), adapted to provide such service.
The restaurant’s drive-through window had a turntable of bulletproof glass designed to allow transactions while preventing robberies.