Plain English Meaning
The speed that lets the airplane glide the farthest after losing engine power. Fly faster or slower than this speed and the airplane will come down sooner and reach less ground.
Full Definition
The airspeed that produces the greatest forward distance traveled per foot of altitude lost when the airplane is gliding without engine power. It corresponds to the lift-to-drag ratio's maximum point for a given configuration and weight, and is published in the Pilot's Operating Handbook for each airplane.
Context Anchor
You will use this term during glide practice and during an engine-out procedure, when you need to stretch the airplane’s glide to reach a .