drive-in n 1: any installation designed to accommodate patrons in their automobiles
drive-in \drive-in\ a. arranged to allow business to be transacted while patrons remain in their vehicles; as, a drive-in window at a bank. Syn: drive-through. [WordNet 1.5]
drive-in \drive-in\ n. any installation designed to accommodate patrons while staying in their automobiles; especially an outdoor movie theater in which patrons park in their vehicles to watch the movie. [WordNet 1.5]