noun Etymology: Middle English, from Latin altitudo height, depth, from altus high, deep — more at old Date: 14th century 1. a. the angular elevation of a celestial object above the horizon b. the vertical elevation of an object above a surface (as sea level or land) of a planet or natural satellite c. (1) a perpendicular line segment from a vertex of a geometric figure (as a triangle or a pyramid) to the opposite side or the opposite side extended or from a side or face to a parallel side or face or the side or face extended (2) the length of an altitude 2. a high level (as of quality or feeling) <
the altitudes of his anger
3. a. vertical distance or extent b. position at a height c. an elevated region ; eminenceusually used in plural Synonyms: see heightaltitudinal adjectivealtitudinous adjective

New Collegiate Dictionary. 2001.