Earth

1. The land surface of the world. The softer, friable part of land; soil, especially productive soil. 2. 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).