Final answer:
The Aerodrome Security Regulation defines the Airside Area within the perimeter security fences of the airport. This area includes runways, taxiways, and aprons where aircraft operations take place, and it has restricted access to ensure safety and security.
Step-by-step explanation:
The area inside the perimeter security fences of the airport that is defined in the Aerodrome Security Regulation is the Airside Area. This area includes the runways, taxiways, and aprons where aircraft are parked, loaded, and unloaded. It is a restricted area with controlled access to ensure the safety and security of aircraft operations. The Aerodrome Security Regulation specifies the rules and requirements for maintaining security in this area.