From geo- + stationary.

geostationary (not comparable)

1. At a fixed distance in three dimensions relative to a particular point on the Earth's surface; generally only possible with orbital satellites.
   • 1971, Thomas A. Croft, Measurement of a Solar Wind Plasma Stream which Endures Several Months But is Intermittent on a Time Scale of about One Day‎^{[http://books.google.com/books?vid=0JYtD7ICGTfuUvacezdWnn5&id=lzMFAAAAIAAJ&dq=geostationary+date:1500-1975&q=geostationary%20date:1500-1975&pgis=1]}:

     The measurement is accomplished by observing the Faraday rotation angle of signals from geostationary satellites on a continuous basis.

• geosynchronous
• heliostationary
• heliosynchronous

• French: géostationnaire
• German: geostationär
• Italian: geostazionario
• Russian: геостационарный