quadrilateral Meaning, Definition & Usage

  1. noun a four-sided polygon
    quadrangle; tetragon.
  2. adjective satellite having four sides
    four-sided.

WordNet

Quad`ri*lat"er*al adjective
Etymology
L. quadrilaterus: cf. F. quadrilatère, quadrilatéral. See Quadri- and Lateral.
Definitions
  1. Having four sides, and consequently four angles; quadrangular.
Quad`ri*lat"er*al noun
Definitions
  1. (Geom.) 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.

Webster 1913