What is the meaning of Mountaineer?

A person who lives in a mountainous area (often with the connotation that such people are outlaws or uncivilized).

A person who climbs mountains for sport or pleasure.

An animal or plant that is native to a mountainous area.

A bird of the genus Oreonympha; also called the bearded mountaineer or eastern mountaineer

To climb mountains; to climb using the techniques of a mountaineer.

To climb as if on a mountain.

Source: wiktionary.org