altitude

The absolute height of a location, usually measured from sea level.

As the altitude increases, the temperature gets lower, so remember to bring warm clothes to the mountains.

Like most human activities, ballooning has sponsored heroes and hucksters and a good deal in between. For every dedicated scientist patiently recording atmospheric pressure and wind speed while shivering at high altitudes, there is a carnival barker with a bevy of pretty girls willing to dangle from a basket or parachute down to earth.

A vertical distance.

The line perpendicularly connecting a figure’s vertex, especially a triangle’s apex, to the side opposite to the vertex.

All three altitudes of any triangle will always meet at point known as the orthocentre or orthocenter.

The length of such a line; the distance measured perpendicularly from a figure's vertex to the side opposite to the vertex.

The perpendicular height of a triangle is known as its altitude.

The angular distance of a heavenly body above our Earth's horizon.