of or pertaining to a satellite traveling in an orbit 22,300 miles (35,900 km) above the earth's equator: at this altitude, the satellite's period of rotation, 24 hours, matches the earth's and the satellite always remains in the same spot over the earth: geostationary orbit.
Also, geosynchronous [jee-oh-sing-kruh-nuhs] .

1960–65; geo- + stationary Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
geostationary (ˌdʒiːəʊˈsteɪʃənərɪ)
Also: geosynchronous (of a satellite) in a circular equatorial orbit in which it circles the earth once per sidereal day so that it appears stationary in relation to the earth's surface

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The idea was two decades ahead of its time, and helped to attach his name to the geostationary orbit above the equator.
Geostationary satellites introduce a delay that many find intolerable.
Plus it may not even be possible due to the drift of geostationary bodies due to lunar gravity.
The second orbit used by communications satellites is geostationary orbit.
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