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A

Abseil

The process by which a climber can descend a fixed rope. Also known as Rappel


Altitude Sickness

A medical condition that is often observed at high altitudes. Also known as Acute mountain sickness, or AMS


Arête

  1. A small ridge-like feature or a sharp outward facing corner on a steep rock face
  2. Arête, a narrow ridge of rock formed by glacial erosion
  3. A method of indoor climbing, in which one is able to use such a corner as a hold. See also dihedral.
Ascend