passageway

Etymology

passage + way

noun

1. A covered walkway, between rooms or buildings.
   The door of the twins' room opposite was open; a twenty-watt night-light threw a weak yellow glow into the passageway. David could hear the twins breathing in time with each other. 1994, Stephen Fry, chapter 2, in The Hippopotamus
2. Any way for passing in, out or through something.
   The units have transverse seats, two and three astride the passageway with single or double longitudinal seats alongside the two entrance vestibules in each car. 1960 November, “New electric multiple-units for British Railways: Glasgow Suburban”, in Trains Illustrated, page 660