Plain English Meaning
The painted lines and symbols on the ground at an airport that tell pilots which strip of pavement is the runway, which is a taxiway, where to stop, and how to get from one place to another safely.
Full Definition
The painted lines, numbers, letters, and symbols on runway and taxiway surfaces that identify the pavement, show where aircraft may operate, indicate hold positions, and convey operational information such as runway designation, centerline, threshold, and taxi routing. Runway markings are normally white; taxiway markings are normally yellow.
Context Anchor
You encounter runway and taxiway markings during airport operations training, while taxiing, , , and when studying movement.