satellite

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An object launched to orbit Earth or another celestial body, as a device for reflecting or relaying radio signals or for capturing images.
• noun Astronomy A celestial body, such as a moon, planet, comet, or other solar system body, that orbits a larger body.
• noun A small unit in a system or organization that is managed or controlled by a larger, often centrally located unit.
• noun A nation dominated politically and economically by another nation.
• noun An urban or suburban community located near a big city.
• noun One who attends a powerful dignitary; a subordinate.
• noun A subservient follower; a sycophant.
• noun Genetics A short segment of a chromosome separated from the rest by a constriction, typically associated with the formation of a nucleolus.
• noun Microbiology A colony of microorganisms whose growth in culture medium is enhanced by certain substances produced by another colony in its proximity.
• adjective Of, relating to, or being a satellite.
• adjective Of or relating to the transmission of electromagnetic signals by communications satellite.

from The Century Dictionary.

• noun There are thus 26 satellites of 6 planets, of which 25 have been discovered in modern times (since 1610) by 9 observers (Galileo 4, Cassini 4, W. Herschel 4, Lassell 3, Hall 2, Perrine 2, Pickering 2, others 1 each).
• noun The point of intersection with a cubic curve of a tangent at a given point of the curve is this given point's satellite.
• noun A vein accompanying an artery.
• noun One of the smaller pathological formations which are associated with the primary larger one.
• noun In gregarines, any member except the first in a chain-like association. Compare primite.
• noun A follower; particularly, a subservient or obsequious follower or attendant; a subordinate attendant.
• noun An attendant moon; a small planet revolving round a larger one; a secondary planet.
• noun [In the above quotation the Latin plural satellites is used instead of the English plural.]
• noun In geometry, a straight line bearing the following relation to another straight line.
• noun In entomology, a satellite-sphinx.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Anat.) Situated near; accompanying.
• noun An attendant attached to a prince or other powerful person; hence, an obsequious dependent.
• noun (Astron.) A secondary planet which revolves about another planet. See Solar system, under Solar.
• noun (Zoöl.) a handsome European noctuid moth (Scopelosoma satellitia).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any celestial body orbiting around a planet or star
• adjective surrounding and dominated by a central authority or power
• noun a person who follows or serves another
• noun man-made equipment that orbits around the earth or the moon
• verb broadcast or disseminate via satellite