Altitude
WordNet
noun
(1) Elevation especially above sea level or above the earth's surface
"The altitude gave her a headache"
(2) Angular distance above the horizon (especially of a celestial object)
(3) The perpendicular distance from the base of a geometric figure to opposite vertex (or side if parallel)
WiktionaryText
Noun
- The height measured from sea level up to any given point.
- A vertical distance.
- The distance measured perpendicularly from a figure's vertex to the opposite side of 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.