A four-sided geometric figure or polygon, also called a quadrilateral. In architecture, it refers to a rectangular courtyard surrounded by buildings, especially in colleges and universities.
From Latin 'quadrangulum,' composed of 'quattuor' (four) + 'angulus' (angle). The term entered English in the 15th century, initially for the geometric shape, then extended to describe architectural layouts featuring four-sided courtyards.
University quadrangles create a sense of academic intimacy and community by enclosing space, a design principle dating back to medieval monasteries where learning and contemplation required protection from worldly distractions. The Harvard Yard and Oxford's college quads became the template for campus design worldwide.
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