Definitions for "Mechanical Movement"
Vintage watch movements are powered by a mainspring and a balance wheel. Mechanical movements must be wound - either manually or via a self winding mechanism - on a regular basis. They are not battery operated.
A movement powered by a mainspring.
A movement based on a mainspring which is wound by hand; when wound, it slowly unwinds the spring in an even motion. An automatic mechanical requires no winding because of the rotor, which winds the mainspring every time you move your wrist.