altitude altitude /ˈæltɪˌtjuːd/

noun

1. () Elevation especially above sea level or above the earth's surface  ( height , altitude )
   elevation especially above sea level or above the earth's surface
    The altitude gave her a headache
   the altitude gave her a headache
   
2. Angular distance above the horizon (especially of a celestial object)  ( ALT , altitude , EL , elevation )
   angular distance above the horizon (especially of a celestial object)
   
3. The perpendicular distance from the base of a geometric figure to the opposite vertex (or side if parallel)  ( altitude )
   the perpendicular distance from the base of a geometric figure to the opposite vertex (or side if parallel)