'Corridor' is Italian for 'running place' — from Latin 'currere' (to run). Originally a military passage.
A long, narrow passage in a building from which doors lead into rooms; a hallway or gallery connecting parts of a structure.
From French 'corridor,' from Italian 'corridore' (a running place, a gallery), from 'correre' (to run), from Latin 'currere' (to run), from PIE *kers- (to run). The original Italian sense was a fortification term — a covered passageway along the walls of a castle through which defenders could run to different positions during a siege. The architectural sense of an interior passageway connecting rooms developed in the seventeenth century as corridor-plan buildings replaced the older enfilade layout where rooms opened directly into each other. Key
The corridor was originally a military term — it described the covered running passages built into castle walls so that soldiers could sprint to defensive positions during a siege. Its transformation into a peaceful domestic hallway only occurred in the seventeenth century, when architects realized that connecting rooms with a neutral passage gave occupants something revolutionary: privacy.