corridor

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A narrow hallway, passageway, or gallery, often with rooms or apartments opening onto it.
• noun A tract of land designated or used for a specific purpose, as for railroad lines, highways, or pipelines.
• noun A route designated for a specific purpose.
• noun A route or tract of land used by migrating animals.
• noun A thickly populated strip of land connecting two or more urban areas.
• idiom (corridors of power) The places or positions from which people in authority wield power.

from The Century Dictionary.

• noun In car-building, a narrow passage between the side of a sleeping-, dining-, stateroom- or other car and a partition which incloses the staterooms, lavatory, kitchen, or other apartment.
• noun In architecture, a gallery or passage in a building.
• noun In fortification, a covered way carried round the whole compass of the fortifications of a place. Wilhelm, Mil. Dict.
• noun See the extract.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Arch.) A gallery or passageway leading to several apartments of a house.
• noun (Fort.), rare The covered way lying round the whole compass of the fortifications of a place.
• noun any relatively narrow passageway or route, such as a strip of land through a foreign territory.
• noun a densely populated stretch of land.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A narrow hall or passage with rooms leading off it, for example in railway carriages (see Wikipedia).
• noun A restricted tract of land that allows passage between two places.
• noun Airspace restricted for the passage of aircraft.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an enclosed passageway; rooms usually open onto it