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Definition of quadrilateral: 1. A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines.
2. An area defended by four fortresses supporting each other; as, the Venetian quadrilateral, comprising Mantua, Peschiera, Verona, and Legnano.
3. Having four sides, and consequently four angles; quadrangular.

Synonyms:

multilateral, four-sided, many-sided

square (part of speech: noun)

square, cube, rectangle, block

geometric figure (part of speech: noun)

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

four (part of speech: noun)

quadrennium, quarto, quartet, quad, four, quadrature, quaternary, quadrangular, rectangular, quadrille, foursome

See how do you define quadrilateral. See quadrilateral definition.