1.Definition: angular distance above the horizon (especially of a celestial object)

Related Noun(s):alt, el, elevation

Category: General

2.Definition: elevation especially above sea level or above the earth's surface

"The altitude gave her a headache"

Related Noun(s):height

Category: General

3.Definition: the perpendicular distance from the base of a geometric figure to the opposite vertex (or side if parallel)

Category: General