- (n.) 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.
- (n.) Height of degree; highest point or degree.
- (n.) 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. It is either true or apparent; true when measured from the rational or real horizon, apparent when from the sensible or apparent horizon.
- (n.) Height of rank or excellence; superiority.
- (n.) Elevation of spirits; heroics; haughty airs.
- (n.) 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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). altitude. Retrieved September 23, 2026, from http://smartdefine.org/altitude/definitions/1972806 |
| Chicago | Webster's. 2011. "altitude" http://smartdefine.org/altitude/definitions/1972806 (accessed September 23, 2026). |
| Harvard | Webster's 2011, altitude, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/altitude/definitions/1972806>. |
| MLA | Webster's. "altitude" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/altitude/definitions/1972806> |