Plain English Meaning
A tiny electronic light that uses very little power and lasts a long time. Most modern flashlights, cockpit lights, and aircraft position lights use them.
Full Definition
A small semiconductor device that produces light when an electric current passes through it. LEDs are valued in aviation for their low power draw, long service life, durability under vibration, and ability to produce bright, focused light from a compact source.
Context Anchor
Seen in pilot equipment discussions, especially flashlights, headlamps, cockpit lighting, and night-flying gear.
Derivation
From three -English parts: 'light-emitting' means it gives light, and '' is an electronic component that allows current to flow in one direction. Knowing it is a diode explains why LEDs only when wired the correct way around.