Plain English Meaning
A radial is one of 360 invisible lines that point outward from a ground navigation station like spokes on a wheel. Each line is named by its compass direction from the station.
Full Definition
A magnetic bearing extending outward from a VOR, VORTAC, or TACAN navigation station. Radials are numbered 001 through 360 and define a specific line of position from the station outward in any direction.
Context Anchor
Pilots encounter radials in navigation, instrument flying, charted procedures, and air traffic control instructions such as intercepting or tracking a specific radial.
Derivation
From Latin '' meaning 'spoke of a wheel' or 'ray.' The meaning directly: each radial is a spoke radiating outward from the station at the .