Plain English Meaning

A direct route between points you pick (or ATC assigns) instead of following the established highways in the sky. Your navigation equipment lets you fly straight to those points without needing a ground-based station along the way.

Full Definition

An off-airway, area navigation route flown directly between waypoints chosen by the pilot or assigned by ATC, rather than along a published airway. It is available to aircraft equipped with approved RNAV (area navigation) systems and may be flown at any altitude where direct routing is approved.