Definition of "quadrilateral" []

• Mathematics A polygon having four sides. (noun)
• Having four sides. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "For instance, the term quadrilateral, or four-sided rectilinear figure, is correctly divided into square, oblong, rhombus, rhomboid and trapezium."
• "In the dead center of the quadrilateral was the sign of the pentagram."
• "So far as the so-called quadrilateral talks were concerned, these were one-off talks at officer level between Australia, US, India and Japan."