British Dictionary definitions for most altitudinous
altitude
/ˈæltɪˌtjuːd/
noun
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) Also called elevation. the angular distance of a celestial body from the horizon measured along the vertical circle passing through the body Compare azimuth (sense 1)
4.
(surveying) the angle of elevation of a point above the horizontal plane of the observer
The height of an object or structure above a reference level, usually above sea level or the Earth's surface.
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.
Mathematics The perpendicular distance from the base of a geometric figure, such as a triangle, to the opposite vertex, side, or surface.