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altitude (n.)

late 14c., "elevation above the horizon" (of stars, planets), from Latin altitudinem (nominative altitudo) "height, altitude," from altus "high," literally "grown tall," from PIE root *al- (2) "to grow, nourish." General sense "space upward, height, vertical extent" is from early 15c. Related: Altitudinal; altitudinous.

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Definitions of altitude from WordNet

altitude (n.)
elevation especially above sea level or above the earth's surface;
the altitude gave her a headache
Synonyms: height
altitude (n.)
the perpendicular distance from the base of a geometric figure to the opposite vertex (or side if parallel);
altitude (n.)
angular distance above the horizon (especially of a celestial object);
Synonyms: elevation / el / alt
From wordnet.princeton.edu