'altitude' definitions:

Definition of 'altitude'

From: WordNet
noun
Elevation especially above sea level or above the earth's surface; "the altitude gave her a headache" [syn: altitude, height]
noun
The perpendicular distance from the base of a geometric figure to the opposite vertex (or side if parallel)
noun
Angular distance above the horizon (especially of a celestial object) [syn: elevation, EL, altitude, ALT]

Synonyms of 'altitude'

From: Moby Thesaurus