What does earth's plate mean

A tectonic plate (also called lithosphere plate) is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere. Plate size can vary greatly, from a few hundred to thousands of kilometers across; the Pacific and Antarctic Plates are among the largest.

earth plate (Noun) An electrode, in the form of a metal plate buried in external soil, used to earth the electrical system of a building.