quad·​ri·​lat·​er·​al | \ ˌkwä-drə-ˈla-t(ə-)rəl How to pronounce quadrilateral (audio) \

Definition of quadrilateral

 (Entry 1 of 2)

: a polygon of four sides



Definition of quadrilateral (Entry 2 of 2)

: having four sides

Examples of quadrilateral in a Sentence

Recent Examples on the Web: Noun Mathematicians recently discovered two quadrilaterals with that property — dartlike shapes with angle ratios of 1:1:1:9 and 1:1:2:8. Quanta Magazine, 15 Aug. 2017 Our examples above use equilateral triangles (regular triangles), squares (regular quadrilaterals) and regular hexagons. Quanta Magazine, 11 Dec. 2017 Finally, the scientists created quadrilaterals with different combinations of vertices. Adrian Cho, Science | AAAS, 14 Oct. 2019 These presumably would have yielded more complicated configurations of objects in the sky today: triangular arrangements of galaxies, along with quadrilaterals, pentagons and other shapes. Quanta Magazine, 29 Oct. 2019 Of the more than 65,000 possible quadrilaterals, only 140 of them would fold, the researchers found. Adrian Cho, Science | AAAS, 14 Oct. 2019 However, from that lexicon of foldable quadrilaterals, the researchers could assemble much larger origamis. Adrian Cho, Science | AAAS, 14 Oct. 2019 The ancient Greeks proved that the only regular polygons that tile are triangles, quadrilaterals and hexagons (as now seen on many a bathroom floor). Quanta Magazine, 11 July 2017 With Arabists like Eddy and Aramco’s government relations men urging him on, the president would attempt a bolder progression—to turn his tri-faith America into a quadrilateral. Darren Dochuk, The New Republic, 17 July 2019 Recent Examples on the Web: Adjective In recent months, the government of Prime Minister Mario Draghi has exhibited an interest in becoming more involved in the quadrilateral alignment of America, Australia, India and Japan established to counter Chinese ambitions in Asia. Loren Thompson, Forbes, 15 Nov. 2021 The new shapes were inspired by my love for quadrilateral shapes and staying true to a really square silhouette that would look great on any faces. Angela Lei, Forbes, 6 May 2021 Nestled within that quadrilateral are two lenses—a wide-angle and a telephoto—but as has always been the case with the Pixel’s camera, the software is more important than the hardware. Wired, 15 Oct. 2019 In May, Japan conducted its first quadrilateral exercise with France, the U.S. and Australia in the Bay of Bengal. Washington Post, 3 July 2019 The Trump administration should help further incorporate India into this emerging quadrilateral relationship between themselves, Japan, and Australia. Evan Moore, National Review, 1 Feb. 2018 Admiral Harris’s proposal of a quadrilateral security grouping, given at a forum hosted by the Observer Research Foundation, is certain to capture Beijing’s attention. Ellen Barry, New York Times, 2 Mar. 2016 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'quadrilateral.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of quadrilateral


1650, in the meaning defined above


1656, in the meaning defined above

History and Etymology for quadrilateral


Latin quadrilaterus four-sided, from quadri- + later-, latus side

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The first known use of quadrilateral was in 1650

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Cite this Entry

“Quadrilateral.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/quadrilateral. Accessed 23 May. 2022.

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More Definitions for quadrilateral


quad·​ri·​lat·​er·​al | \ ˌkwä-drə-ˈla-tə-rəl How to pronounce quadrilateral (audio) \

Kids Definition of quadrilateral

: a flat geometric figure of four sides and four angles


quad·​ri·​lat·​er·​al | \ ˌkwäd-rə-ˈlat-ə-rəl, -ˈla-trəl How to pronounce quadrilateral (audio) \

Medical Definition of quadrilateral

: having four sides a quadrilateral muscle


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