noun

1. The point, in an orbit about the Earth, that is furthest from the Earth: the apoapsis of an Earth orbiter.

2. (more generally) The point, in an orbit about any planet, that is farthest from the planet: the apoapsis of any satellite.

3. (possibly obsolete outside astrology) The point, in any trajectory of an object in space, where it is furthest from the Earth.

Synonyms: acme, climax, culmination, pinnacle, zenith, apoapsis, apocenter, apsis