" altitude(s) "

[Noun]  | "al*ti*tude" | \ ˈal-tə-ˌtüd \

1: the vertical elevation of an object above a surface (such as sea level or land) of a planet or natural satellite

2: the angular elevation of a celestial object above the horizon

3: a perpendicular line segment from a vertex of a geometric figure (such as a triangle or a pyramid) to the opposite side or the opposite side extended or from a side or face to a parallel side or face or the side or face extended

Origin: 14th century ;

 Middle English, "height, angular height of a celestial body above the horizon," borrowed from Latin altitūdin-, altitūdō "height, high position, downward extension, depth," from altus "extending upward, tall, high, extending downward, deep" + -i- {see: |-i-|-i-} + -tūdin-, -tūdō {see: |-tude|-tude}; altus going back to dialectal Indo-European *al-to- (whence also Middle Irish alt, allt "height, cliff," Welsh allt "hill, steep slope, cliff"), of uncertain origin;

  * Note : Traditionally equated with Germanic *alđa- "old," and further to a verbal base *al- "nourish" (< Indo-European *h2el- "nourish, feed;" see: {old:1|old:1}), on the assumption that the verbal adjective *al-to- "fully grown, nourished" leads to both "old" and "high." However, both the Latin and Celtic etyma refer primarily or exclusively to points situated above the ground, not human or animal growth, so such a connection is questionable.;

[Noun]  | "altitudes" 

[Noun]  | "altitude"