Plain English Meaning
A known, named point in the sky that pilots and controllers can both identify. It tells you exactly where you are or where you're going on a route.
Full Definition
A geographical position determined by visual reference to the surface, by reference to one or more radio navigational aids, by celestial plotting, or by another navigational device. A fix is used to identify a specific point in space along a route, an arrival or departure procedure, or a holding pattern.
Context Anchor
Seen on charts, routes, clearances, and approach procedures as named points an may fly to, cross, or .