altitude (ˈæltɪˌtjuːd)  
—n  
1.  the vertical height of an object above some chosen level, esp above sea level; elevation 
2.  geometry the perpendicular distance from the vertex to the base of a geometrical figure or solid 
3.  astronomy, nautical Compare azimuth Also called: elevation the angular distance of a celestial body from the horizon measured along the vertical circle passing through the body 
4.  surveying the angle of elevation of a point above the horizontal plane of the observer 
5.  (often plural) a high place or region 
[C14: from Latin altitūdō, from altus high, deep]  
alti'tudinal  
—adj 
altitude (āl'tĭtd') Pronunciation Key
