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1. Geometry a plane figure consisting of four points connected by four lines. In a complete quadrangle, six lines connect all pairs of points
2. a rectangular courtyard, esp one having buildings on all four sides
3. the building surrounding such a courtyard

A rectangular courtyard or grassy area enclosed by buildings, most often used in conjunction with academic or civic building groupings.

[′kwä‚draŋ·gəl]
(civil engineering)
A four-cornered, four-sided courtyard, usually surrounded by buildings.
The buildings surrounding such a courtyard.
A four-cornered, four-sided building.
(mapping)
A four-sided tract of land, defined by parallels of latitude and meridians of longitude, used as an area unit in systematic mapping.
(mathematics)
A geometric figure bounded by four straight-line segments called sides, each of which intersects each of two adjacent sides in points called vertices, but fails to intersect the opposite sides. Also known as quadrilateral.