[al-ti-tood, -tyood]
the height of anything above a given planetary reference plane, especially above sea level on earth.
extent or distance upward; height.
Astronomy. the angular distance of a heavenly body above the horizon.
the perpendicular distance from the vertex of a figure to the side opposite the vertex.
the line through the vertex of a figure perpendicular to the base.
Usually, altitudes. a high place or region: mountain altitudes.
high or important position, rank, etc.

1350–1400; Middle English < Latin altitūdō; see alti-, -tude

altitudinous [al-ti-tood-n-uhs, -tyood-] , adjective

1. altitude, elevation, height (see synonym study at height) ; 2. altitude, attitude.

1. elevation. 1, 2. See height.

2. depth. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
altitude (ˈæltɪˌtjuːd)
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]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 14c., from L. altitudo (gen. altitudinis), from altus "high" (see old).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
altitude   (āl'tĭ-td')  Pronunciation Key 
  1. The height of an object or structure above a reference level, usually above sea level or the Earth's surface.

  2. Astronomy The position of a celestial object above an observer's horizon, measured in degrees along a line between the horizon (0°) and the zenith (90°). Unlike declination and celestial latitude—the corresponding points in other celestial coordinate systems—the altitude of star or other celestial object is dependent on an observer's geographic location and changes steadily as the sky passes overhead due to the rotation of the Earth. See more at altazimuth coordinate system.

  3. Mathematics The perpendicular distance from the base of a geometric figure, such as a triangle, to the opposite vertex, side, or surface.

The American Heritage® Science Dictionary
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