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Definition of quadrangle: 1. 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, esp. such a court in a college or public school in England.

Synonyms:

close, campus, forum, alley, patio, quadriceps, space, courtyard, musculus quadriceps femoris, arcade, atrium, backyard, quad, quadruplet, place, yard, enclosure, cloister, back, car park, court, quadriceps femoris, blind alley, alleyway

tetragram, trapezoid, pentagon, tetrahedron, heptagon, hexahedron, octagon, polygon, decagon, cube, octahedron, isosceles triangle, tetragon, dodecagon, rectangle, scalene triangle, quadrilateral, parallelepiped, dodecahedron, cusp, square, equilateral triangle, hexagon, pentahedron, triangle, polyhedron, right-angle triangle, parallelogram, rhombus

quartet, foursome, quadrennium, quadrature, four, quadrille