Which term describes the space separating galleys and lavatories from passenger areas?

The term that describes the space separating galleys and lavatories from passenger areas is "bulkhead." A bulkhead is a vertical partition that creates a barrier between different sections of the aircraft, such as separating the galley and lavatories from the seating area for passengers. This design provides privacy and helps manage the flow of movement and activities within the cabin, ensuring comfort for passengers while also facilitating the operational needs of the crew.

The other terms do not apply in this context. An aisle refers to the passageway that runs down the length of the passenger cabin, allowing for movement between seats. The fuselage is the main body of the aircraft that houses passengers and cargo, encompassing all areas inside but not specifically referring to the separation between functional areas. The cockpit is the area at the front of the aircraft where pilots control the plane and is distinct from the passenger cabin. Therefore, the correct identification of a bulkhead highlights its crucial role in cabin layout and passenger experience.