The absolute height of a location, usually measured from sea level. / A vertical distance. / (geometry) The distance measured perpendicularly from a figure's vertex to the opposite side of the vertex.

plural of altitude

(medicine) A pathological condition caused by oxygen deficiency at high altitudes; symptoms include shortness of breath, nausea, and nosebleed.

(aviation) The vertical distance between the airplane and the surface below.

plural of critical altitude

the altitude at which atmospheric pressure becomes constant as altitude increases

(aviation) A measure of altitude inferred by the measurement of ambient pressure in differential with a reference pressure at a known altitude.

plural of pressure altitude

(idiomatic, archaic) drunk.

plural of absolute altitude