the height of anything above a given planetary reference plane, especially above sea level on earth.

extent or distance upward; height.

Astronomy. the angular distance of a heavenly body above the horizon.

Geometry.

the perpendicular distance from the vertex of a figure to the side opposite the vertex.

the line through the vertex of a figure perpendicular to the base.

Usually altitudes.a high place or region: mountain altitudes.

high or important position, rank, etc.

Origin of altitude

1350–1400;Middle English < Latinaltitūdō; see alti-, -tude

Related formsal·ti·tu·di·nous[al-ti-tood-n-uhs, -tyood-]/ˌæl tɪˈtud n əs, -ˈtyud-/, adjectiveCan be confusedaltitudeelevationheight (see synonym study at height)altitudeattitude

the vertical height of an object above some chosen level, esp above sea level; elevation

geometrythe perpendicular distance from the vertex to the base of a geometrical figure or solid

Also called: elevationastronomynauticalthe angular distance of a celestial body from the horizon measured along the vertical circle passing through the bodyCompare azimuth (def. 1)

surveyingthe angle of elevation of a point above the horizontal plane of the observer

The height of an object or structure above a reference level, usually above sea level or the Earth's surface.

AstronomyThe position of a celestial object above an observer's horizon, measured in degrees along a line between the horizon (0°) and the zenith (90°). Unlike declination and celestial latitude-the corresponding points in other celestial coordinate systems-the altitude of star or other celestial object is dependent on an observer's geographic location and changes steadily as the sky passes overhead due to the rotation of the Earth. See more at altazimuth coordinate system.

MathematicsThe perpendicular distance from the base of a geometric figure, such as a triangle, to the opposite vertex, side, or surface.