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Free English Dictionary
Definition of Quadrilateral
- [a.] - Having four sides, and consequently four angles; quadrangular.
- [n.] - A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines.
- [n.] - An area defended by four fortresses supporting each other; as, the Venetian quadrilateral, comprising Mantua, Peschiera, Verona, and Legnano.