The Altitude reference article from the English Wikipedia on 24-Jul-2004
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Altitude is the elevation of an object from a known level or datum, called zero level. Most often this level is defined as the absolute sea level, but it can vary.

In aviation, the term altitude is used to describe elevation above mean sea level, the term height refers to elevation above a ground reference point and the term flight level is the elevation according to a standard pressure altimeter setting.

Atmospheric pressure decreases with altitude.

In North America and the UK altitude is usually measured in feet. In continental Europe and other parts of the world altitude is measured in metres.

In surveying, altitude refers to the vertical angle from the horizon.

See Also

In geometry, an altitude of a triangle is a line passing through one vertex and being perpendicular to the opposite side. See altitude (triangle).