noun
altitude
AL-tih-tood/ˈæltɪtuːd/
A position measured upward from a reference level.
The coastal mountain's altitude is measured upward from sea level.

Etymology
The pieces express the quality of being high. Early English use concerned celestial bodies’ elevation above the horizon; the meaning then broadened to height or vertical extent generally.
In context
enabling to ski at a very high altitude almost at 3 600 meters on a vast Glacier even in summer
More examples
- The plane gains altitude after takeoff.
- The astronomer records the star's altitude above the horizon.
- Plants at higher altitudes face colder growing conditions.
Forms
altitude · altitudes