"altitude" in the noun sense
1. altitude, height
elevation especially above sea level or above the earth's surface
"the altitude gave her a headache"
the perpendicular distance from the base of a geometric figure to the opposite vertex (or side if parallel)
3. elevation, EL, altitude, ALT
angular distance above the horizon (especially of a celestial object)
Source: WordNet® (An amazing lexical database of English)
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