Terrestrial literally means 'of the earth' and is used in a variety of contexts:
In biology and in the general sense, terrestrial means indicates ground-dwelling (compare aquatic). See land.
In broadcasting terrestrial indicates that TV or radio signals are received through a conventional aerial. See terrestrial television.
In communication networking, "terrestrial" indicates signals travelling through fiber optic cable or copper wire, usually located underground or undersea.
In astronomy, terrestrial can refer to the first four planets (http://en.wikipedia.org/wiki/Planet) in the solar system - planets with a rocky exterior.
Terrestrial may also be used in contrast to extra-terrestrial, indicating anything of Earth-origin rather than from outer space.
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A terrestrial planet or telluric planet is a planet which is primarily composed of silicate rocks.
Terrestrial planets are substantially different from gas giants, which may not have solid surfaces and are composed mostly of some combination of hydrogen, helium, and water existing in various physical states.
Terrestrial planets all have roughly the same structure: a central metallic core, mostly iron, with a surrounding silicate mantle.
Terrestrialtelevision (also known as over-the-air or OTA) is the traditional method of television broadcast signal delivery, by radio waves transmitted through open space.
Terrestrialtelevision broadcasting dates back to the very beginnings of television as a medium itself with the first long-distance public television broadcast from Washington, DC on April 7, 1927.
In North America, terrestrial broadcast television operates on TV channels 2 through 6 (VHF-low band, known as band I in Europe), 7 through 13 (VHF-high band, known as band III elsewhere), and 14 through 69 (UHF television band, elsewhere bands IV and V).
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