passageway

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.”

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.”