Plain English Meaning

All the lights at an airport that help pilots find it, line up with the runway, and move around safely after dark or in poor visibility.

Full Definition

The various lighting systems installed at an airport to identify it from the air, mark its runways and taxiways, indicate approach paths, and support safe operations at night and in low visibility. These systems include rotating beacons, runway edge lights, threshold and end lights, taxiway lights, approach lighting systems, and visual glideslope indicators such as VASI and PAPI.