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

geosynchronous (ˌdʒiːəʊˈsɪŋkrənəs)
another word for geostationary

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Which in turn prevents useful and productive technologies such as
  communications satellites in geosynchronous orbit.
Other objects are sent much farther into space and placed in what is called
  geosynchronous orbit.
If you ascend it to geosynchronous orbit, however, you would be in orbit when
  you stepped off.
Aircraft can then be limited to dirigibles and rocket boosters for putting
  satellites into geosynchronous orbit.
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