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.
Something of the smallest possible extent; an indivisible unit.
At least.
What a stupid white privileged POS I am! Least I call myself out.
2019 December, Justin Blackburn, The Bisexual Christian Suburban Failure Enlightening Bipolar Blues, page 79
The most little; the smallest amount or quantity of something.
Used for forming superlatives of adjectives, especially those that do not form the superlative by adding -est.
In the smallest or lowest degree; in a degree below all others.