Glossary
What is best glide speed?
The airspeed that covers the most ground for the altitude lost with the engine producing no thrust. The figure belongs to the individual airplane and shifts with weight, so the only correct source for it is that aircraft's flight manual.
Also called Best glide
That is the whole entry for now. The longer version, with the mechanics and worked examples, is still to be written. See autorotation for how those read once they exist.