[TheWoolRug]

Altitude= not connected to the ground.

Elevation= connected to the ground.

[fooker]

High-altitude is a commonly used pair of words to refer to mountain locations.

[morbicer]

https://en.wikipedia.org/wiki/Altitude_sickness

[dboreham]

Cool, but not in the English I learned.

[AlotOfReading]

I challenge you to find a dictionary that doesn't include "elevation above sea level" in one of the definitions for altitude.