designating or of a satellite or spacecraft in an orbit above the equator, revolving at a rate of speed synchronous with that of the earth's rotation so that it always stays above the same place on the earth's surface
See geostationary in American Heritage Dictionary 4
(jēˌō-stāˈshə-nĕrˌē)
adjective
Of, relating to, or being a satellite that travels above Earth's equator from west to east at an altitude of approximately 35,900 kilometers (22,300 miles) and at a speed matching that of Earth's rotation, thus remaining stationary in relation to Earth.
Of, relating to, or being the orbit of such a satellite.