Definition of geostationary adjective from the Oxford Advanced American Dictionary

 

geostationary

 adjective
adjective
NAmE//ˌdʒioʊˈsteɪʃəˌnɛri//
 
(astronomy)
 
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(of a satellite) moving around the earth at the equator at the same speed as the earth spins, so that it appears to be always in the same place in the sky
See the Oxford Advanced Learner's Dictionary entry: geostationary