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 opposite vertex (or side if parallel)
The perpendicular distance from the base of a figure to the summit, or to the side parallel to the base; as, the altitude of a triangle, pyramid, parallelogram, frustum, etc
If something is at a particular altitude, it is at that height above sea level. The aircraft had reached its cruising altitude of about 39,000 feet. altitude of
elevation especially above sea level or above the earth's surface; "the altitude gave her a headache"
The elevation of a point, or star, or other celestial object, above the horizon, measured by the arc of a vertical circle intercepted between such point and the horizon
Space extended upward; height; the perpendicular elevation of an object above its foundation, above the ground, or above a given level, or of one object above another; as, the altitude of a mountain, or of a bird above the top of a tree