The highest point.
The point, in any trajectory of an object in space, where it is farthest from the Earth.
The point, in an orbit about the Earth, that is farthest from the Earth: the apoapsis of an Earth orbiter.
The point, in an orbit about any planet, that is farthest from the planet: the apoapsis of any satellite.
The smallest amount.
He always tries to get away with doing the minimum.
The lowest limit.
A period of minimum brightness or energy intensity (of a star).
The smallest member of a batch or sample or the lower bound of a probability distribution.
A lower bound of a set which is also an element of that set.
To the lowest degree.