Pronunciation: (al'ti-tOOd", -tyOOd"),[key] —n. 1. the height of anything above a given planetary reference plane, esp. above sea level on earth.
2. extent or distance upward; height.
3. Astron.the angular distance of a heavenly body above the horizon.
4. Geom. a. the perpendicular distance from the vertex of a figure to the side opposite the vertex.
b. the line through the vertex of a figure perpendicular to the base.
5. Usually, altitudes. a high place or region: mountain altitudes. 6. high or important position, rank, etc.