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From The Collaborative International Dictionary of English v.0.48:
Quadrangle \Quad"ran`gle\, n. [F., fr. L. quadrangulum; quattuor four + angulus an angle. See Four, and Angle a corner.] [1913 Webster] 1. (Geom.) A plane figure having four angles, and consequently four sides; any figure having four angles. [1913 Webster] 2. 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. [1913 Webster]