Plain English Meaning
A departure route from an airport that you fly using traditional radio navigation stations on the ground, not GPS or other area navigation. The chart tells you which navaids to track, what headings to fly, and how steeply to climb until you join your en route course.
Full Definition
A published departure procedure designed to be flown using ground-based navigation aids (such as VORs, NDBs, or DME) rather than area navigation systems. A Non-RNAV DP provides a specific route and climb gradient from the to the , with all referenced to and headings.