Definitions for "Quadrilateral"
Having four sides, and consequently four angles; quadrangular.
An area defended by four fortresses supporting each other; as, the Venetian quadrilateral, comprising Mantua, Peschiera, Verona, and Legnano.
A polygon with fours sides and four angles whose sum is 360 degrees.
In GATT parlance, a meeting involving senior trade officials or ministers from the United States, Japan, the European Community, and Canada, convened to discuss trade policy matters and review the status of multilateral negotiations. In trade policy, a Quad meeting at the ministerial level is the equivalent of a 0-7 finance ministers' meeting, since the EC speaks for Germany, France, Italy, and the United Kingdom on trade matters.