Definition of "Earth" :
noun: a connection between an electrical device and a large conducting body, such as the earth (which is taken to be at zero voltage)
noun: the concerns of this life as distinguished from heaven and the afterlife
noun: the abode of mortals (as contrasted with Heaven or Hell)
"It was hell on earth."
noun: the 3rd planet from the sun; the planet we live on
"The Earth moves around the sun."
noun: the solid part of the earth's surface
"The earth shook for several minutes."
noun: the loose soft material that makes up a large part of the land surface
"They dug into the earth outside the church."
noun: once thought to be one of four elements composing the universe (Empedocles)
verb: connect to the earth
"Earth the circuit."
verb: hide in the earth like a hunted animal