Definition of earth:
the 3rd planet from the sun; the planet we live on; "the Earth moves around the sun"; "he sailed around the world"
the loose soft material that makes up a large part of the land surface; "they dug into the earth outside the church"
the solid part of the earth's surface; "the plane turned away from the sea and moved back over land"; "the earth shook for several minutes"; "he dropped the logs on the ground"
the abode of mortals (as contrasted with Heaven or Hell); "it was hell on earth"
once thought to be one of four elements composing the universe (Empedocles)
the concerns of this life as distinguished from heaven and the afterlife; "they consider the church to be independent of the world"
a connection between an electrical device and a large conducting body, such as the earth (which is taken to be at zero voltage)
hide in the earth like a hunted animal
connect to the earth; "earth the circuit"