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The definition of earth

16 Definitions of: earth

1. noun, the third planet from the sun, the only planet on which life is known to exist. It is not quite spherical, being flattened at the poles, and consists of three geological zones, the core, mantle, and thin outer crust. The surface, covered with large areas of water, is enveloped by an atmosphere principally of nitrogen (78 per cent), oxygen (21 per cent), and some water vapour. The age is estimated at over four thousand million years. Distance from sun: 149.6 million km; equatorial diameter: 12 756 km; mass: 5.976 ✕ 10²⁴ kg; sidereal period of axial rotation: 23 hours 56 minutes 4 seconds; sidereal period of revolution about sun: 365.256 days. Related adjs terrestrial, tellurian, telluric, terrene
2. noun, the inhabitants of this planet
3. noun, the dry surface of this planet as distinguished from sea or sky; land; ground
4. noun, the loose soft material that makes up a large part of the surface of the ground and consists of disintegrated rock particles, mould, clay, etc; soil
5. noun, worldly or temporal matters as opposed to the concerns of the spirit
6. noun, the hole in which some species of burrowing animals, esp foxes, live
7. noun, chem. See rare earth, alkaline earth
8. noun, a) a connection between an electrical circuit or device and the earth, which is at zero potential b) a terminal to which this connection is made. US and Canadian equivalent: ground
9. noun, Also called: earth colour any of various brown pigments composed chiefly of iron oxides
10. noun, astrology of or relating to a group of three signs of the zodiac, Taurus, Virgo, and Capricorn. Compare air, fire, water
11. noun, cost the earth to be very expensive
12. noun, come back or down to earth to return to reality from a fantasy or daydream
13. noun, on earth used as an intensifier in such phrases as what on earth, who on earth, etc
14. noun, run to earth a) to hunt (an animal, esp a fox) to its earth and trap it there b) to find (someone) after searching
15. verb, (of a hunted fox) to go to ground
16. verb, to connect (a circuit, device, etc) to earth ▷ See also earth up
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Synonyms:	planet, world, globe, sphere, orb, ground, land, terra firma, soil, dust	And more...

From Collins