Quadrilateral (noun)

  1. A flat shape with four sides and four angles.
  2. A polygon with four sides.
  3. A figure having four sides, especially a rectangle, a square, a parallelogram, or a trapezium.


Late 16th century: from latin quadrilaterus, from quadri- "four" + later "side".


  1. The quadrilateral was easily transformed into a parallelogram.
  2. The area of the quadrilateral was calculated using the formula for a parallelogram.
  3. The quadrilateral was used as a base for the pyramid.
  4. The quadrilateral was divided into two congruent triangles.
  5. The quadrilateral was drawn on the board to demonstrate geometric concepts.
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