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geostationary
Apparently fixed in position in relation to the earth; describing an artificial satellite that travels above the equator and at the same speed as the earth rotates; so, that it constantly appears at the same point in the sky.
Word Entries at Get Words: “geostationary
geostationary
A description of the orbit of a satellite that circles the earth above the equator at a speed matching the earth's rotation; thus, appearing to remain stationary, or a satellite in such an orbit.

Most communications satellites are in geostationary orbit.

This entry is located in the following unit: Astronomy and related astronomical terms (page 12)