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Quadrilateral1. (a.) Having four sides, and consequently four angles; quadrangular. 2. (n.) A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines. 3. (n.) An area defended by four fortresses supporting each other; as, the Venetian quadrilateral, comprising Mantua, Peschiera, Verona, and Legnano.
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