1. The height of a thing above a reference level, especially above sea level or above the earth's surface. See synonyms at elevation. 2. A high location or area. 3.Astronomy The angular distance of a celestial object above the horizon. 4.Mathematics The perpendicular distance from the base of a geometric figure to the opposite vertex, parallel side, or parallel surface. 5. High position or rank.
ETYMOLOGY:
Middle English, from Latin altitd, from altus, high. See al-2 in Appendix I.