Definitions from Wiktionary ( )

▸ noun:  (now rare) A person who lives in a mountainous area (often with the connotation that such people are outlaws or uncivilized).
▸ noun:  A person who climbs mountains for sport or pleasure.
▸ noun:  (obsolete) An animal or plant that is native to a mountainous area.
▸ noun:  A bird of the genus Oreonympha; also called the bearded mountaineer or eastern mountaineer
▸ verb:  (intransitive) To climb mountains; to climb using the techniques of a mountaineer.
▸ verb:  (intransitive, figurative) To climb as if on a mountain.

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