1. a four-sided polygon
2. a rectangular area surrounded on all sides by buildings

In architecture, a quadrangle or quadrant is a square or court surrounded by buildings. The buildings of monasteries were generally arranged in. quadrangles, as, for instance, the
Found on http://www.probertencyclopaedia.com/browse/TQ.HTM

Inner courtyard.
Found on http://www.encyclo.co.uk/local/20018

inner courtyard
Found on https://www.encyclo.co.uk/local/20402

Quad'ran`gle noun [ French, from Latin quadrangulum ; quattuor four + angulus an angle. See Four , and Angle a corner.] 1. (Geom.) A plane figure having four angles, and consequently four sides; any figure having four angles. 2. A square or q...
Found on http://www.encyclo.co.uk/webster/Q/1

1. <geometry> A plane figure having four angles, and consequently four sides; any figure having four angles. ... 2. A square or quadrangular space or inclosure, such a space or court surrounded by buildings, especially. Such a court in a college or public school in England. ... Origin: F, fr. L. Quadrangulum; quattuor four + angulus an angle....
Found on http://www.encyclo.co.uk/local/20973

• (n.) A plane figure having four angles, and consequently four sides; any figure having four angles. • (n.) A square or quadrangular space or inclosure, such a space or court surrounded by buildings, esp. such a court in a college or public school in England.

in architecture, rectangular open space completely or partially enclosed by buildings of an academic or civic character. The grounds of a quadrangle ...
Found on http://www.britannica.com/eb/a-z/q/3

[horse] Triple Crown race wins:Belmont Stakes (1964) |awards = |honours = |updated= March 4, 2010 Quadrangle (1961–1978) was an American Thoroughbred racehorse who won the 1964 Belmont Stakes. Bred in Virginia by Paul Mellon, he was out of the mare Tap Day, a daughter of the Calumet Farm champion stallion Bull Lea. His sire was the multip...

[geography] In geology or geography, the word `quadrangle` usually refers to a United States Geological Survey (USGS) 7.5-minute quadrangle map, which are usually named after a local physiographic feature. The shorthand `quad` is also used, especially with the name of the map; for example, `the Ranger Creek, Texas quad map`. These maps are ...

[architecture] In architecture, a quadrangle (or colloquially, a quad) is a space or courtyard, usually rectangular (square or oblong) in plan, the sides of which are entirely or mainly occupied by parts of a large building (or several smaller buildings). The word is probably most closely associated with college or university campus archite...

A tract of land represented by one US Geological Survey map sheet.
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Magdalen College, Oxford, quadrangle A plane figure consisting of four points, each of which is joined to two other points by a line segment. A quadrangle may be concave or convex depending on whether the line segments do or don't intersect. A convex quadrangle is a quadrilateral. The word is fro...

[Harvard] The Radcliffe Quadrangle at Harvard University, formerly the residential campus of Radcliffe College, is part of Harvard`s undergraduate campus, in Cambridge, Massachusetts, USA. Generally just called the Quad, it is a traditional college quad slightly removed from the main part of campus. It should not be confused with Radcliffe ...

Inner courtyard.
Found on http://www.castlesontheweb.com/glossary.html