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Quadrilateral

Definition: Having four sides, and consequently four angles;
quadrangular.

Quadrilateral

Definition: A plane figure having four sides, and consequently
four angles; a quadrangular figure; any figure formed by four lines.

Quadrilateral

Definition: An area defended by four fortresses supporting each
other; as, the Venetian quadrilateral, comprising Mantua, Peschiera,
Verona, and Legnano.