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stationary orbit

noun
  1. astronautics an orbit lying in, or approximately in, the plane of the equator for which the orbital period is equal to the spin period of the central body
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012