Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A polygon having four sides.
  • adjective Having four sides.

from The Century Dictionary.

  • Having four sides; composed of four lines.
  • noun A figure formed of four Straight lines.
  • noun Milit., the space inclosed between, and defended by, four fortresses: as, the Bulgarian quadrilateral. The most famous quadrilateral was that in northern Italy, inclosed by the fortresses of Peschiera, Mantua, Verona, and Legnago.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Geom.) A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines.
  • noun An area defended by four fortresses supporting each other.
  • noun (Geom.) the figure made up of the six straight lines that can be drawn through four points, A, B, C, I, the lines being supposed to be produced indefinitely.
  • adjective Having four sides, and consequently four angles; quadrangular.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun a polygon having four sides.
  • adjective having four sides.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective having four sides
  • noun a four-sided polygon

Etymologies

Sorry, no etymologies found.

Examples

  • For instance, the term quadrilateral, or four-sided rectilinear figure, is correctly divided into square, oblong, rhombus, rhomboid and trapezium.

    Deductive Logic

  • In the dead center of the quadrilateral was the sign of the pentagram.

    Vampire a Go-Go

  • In the dead center of the quadrilateral was the sign of the pentagram.

    Vampire a Go-Go

  • In the dead center of the quadrilateral was the sign of the pentagram.

    Vampire a Go-Go

  • In the dead center of the quadrilateral was the sign of the pentagram.

    Vampire a Go-Go

  • So far as the so-called quadrilateral talks were concerned, these were one-off talks at officer level between Australia, US, India and Japan.

    Transcript - The Hon Stephen Smith MP, Minister for Foreign Affairs

  • All these stars are of the second order of magnitude (the specific meaning of this expression will be explained in the next chapter), except the last ([delta]) of the quadrilateral, which is of the third order.

    Astronomy for Amateurs

  • Then this rule would to another: opposite angles in the quadrilateral will be the sum of 180 degrees.

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  • A quadrilateral is a polygon with 4 sides, and the term includes square, rectangle, trapezoid, kite, etc.

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  • Mr. Callahan A quadrilateral is a polygon with four sides.

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