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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:

many-sided, quadrangle, tetragon, multilateral, four-sided.

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