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 architecture, but quadrangles may be found in other buildings such as palaces. Most quadrangles are open-air, while a few have been roofed over (often with glass), to provide additional space for social meeting areas or coffee shops for students.
Some modern quadrangles resemble cloister gardens of medieval monasteries, called garths, which were usually square or rectangular, enclosed by covered arcades or cloisters. However, it is clear from the oldest examples (such as Mob Quad) which are plain and unadorned with arcades, that the medieval colleges at Oxford and Cambridge were creating practical accommodation for college members. Grander quadrangles that look like cloisters came later, once the idea of a college was well established and benefactors or founders wished to create more monumental buildings.
In North America, Thomas Jefferson's design for the University of Virginia centered the housing and academic buildings in a Palladian form around three sides of the Lawn, a huge grassy expanse. Later, some American college and university planners imitated the Jeffersonian plan, the Oxbridge idea, Beaux-Arts forms, and other models. The University of Chicago's Gothic campus is also notable for its innovative use of quadrangles. All five barracks at The Citadel (military college) feature quadrangles with red-and-white squares (the colors of the South Carolina battle flag), which are used for formations by the Corps of Cadets.
- Woodburn Circle, West Virginia University
- Blue Boar Quadrangle
- David R. Francis Quadrangle, University of Missouri
- Memorial Quadrangle
- Mob Quad in Merton College, Oxford is one of the oldest quads in existence.
- Peckwater Quadrangle
- The Quad, Harvard University
- The Dartmouth Green
- The Quadrangle, Springfield, Massachusetts.
- The Quad, University College Cork.
- Radcliffe Quadrangle, University College, Oxford
- Schenley Quadrangle, University of Pittsburgh
- Bascom Hill, University of Wisconsin–Madison
- Tom Quad
- Padmanabhapuram Palace
- University of Alabama Quad
- The Quad, University College London
- Founder's Building, Royal Holloway College, London
- The Diag, University of Michigan
- Buckingham Palace, London, England
- St. Thomas Residential School, Thiruvananthapuram, India
- Academic Quadrangle (AQ), Simon Fraser University
- Sunken Garden, College of William & Mary
- The Lawn, University of Virginia
- The Quad, Louisiana State University
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