"Libertarianism is one of the main philosophical positions
related to the problems of free will and determinism,
which are part of the larger domain of metaphysics.
Libertarianism, ...argues that free will is logically incompatible with a deterministic universe
and that agents have free will, and that therefore determinism is false.
...The term libertarianism in a metaphysical or philosophical sense
was first used by late Enlightenment free-thinkers to refer to those who believed in free will,
as opposed to determinism.
The first recorded use was in 1789 by William Belsham in a discussion of free will
and in opposition to "necessitarian" (or determinist) views."