Earth

1. The land surface of the world. Less than 30% of the Earth's surface is earth, the rest is water.
2. The softer, friable part of land; soil, especially productive soil. Good earth is needed for good crops.
3. Often Earth. The third planet from the sun, having a sidereal period of revolution about the sun of 365.26 days at a mean distance of approximately 149 million kilometers (92.96 million miles), an axial rotation period of 23 hours 56.07 minutes, an average radius of 6,374 kilometers (3,959 miles), and a mass of approximately 5.974 x 1024 kilograms (13.17 x 1024 pounds). The Earth is third planet from the sun.
4. The human inhabitants of the world. The earth received the news with joy.
5. The ground of an electrical circuit. That wire must be grounded to earth.