definition of
altitude

[1] #1 altitude n. [height] elevation especially above sea level or above the earth's surface; "the altitude gave her a headache". wn

[2] #2 altitude n. the perpendicular distance from the base of a geometric figure to the opposite vertex (or side if parallel). wn

[3] #3 altitude n. [elevation, EL, ALT] angular distance above the horizon (especially of a celestial object). wn