Definitions
1.NounThe point, in an orbit about the Earth, that is farthest from the Earth: the apoapsis of an Earth orbiter.
2.NounThe point, in an orbit about any planet, that is farthest from the planet: the apoapsis of any satellite.
3.NounThe point, in any trajectory of an object in space, where it is farthest from the Earth.
4.NounThe highest point.