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.
A culmination or acme: the last term in an ascending series
A rhetorical device in which a series is arranged in ascending order.
The final term of a rhetorical climax.
The culmination of sexual pleasure, an orgasm.
The culmination of a narrative's rising action, the turning point.
The culmination of ecological development, whereby species are in equilibrium with their environment.
To reach or bring to a climax (in any sense).