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quadrilogy
quadrilogy n. 
/kwəˈdrɪlədʒi/,
Brit. /kwɒˈdrɪlədʒi/
, /kwɒˈdrɪlədʒi//kwəˈdrɪlədʒi/U.S. /kwɑˈdrɪlədʒi/
a literary or artistic work consisting of four parts; a series or group of four related works; a tetralogy./kwɑˈdrɪlədʒi/ΘΚΠ
society > leisure > the arts > literature > a written composition > [noun] > related series
trilogy1661
tetralogy1743
tetralogue1820
triology1837
quadrilogy1856
1856 Athenæum 25 Oct. 1313/3 This composer's ‘Nibelungen’ opera (by the way) seems likely to anticipate Herr Wagner's quadrilogy of ‘Nibelungen’ operas.
1865 Athenæum No. 1950. 355/3 His quadrilogy of Nibelungen operas.
1972 C. Barnett Collapse Brit. Power v. 428 R. H. Mottram's Spanish Farm trilogy and Ford Madox Ford's quadrilogy.
1994 Internat. Jrnl. Middle East Stud. 26 636 Opportunism can also be found in Fahti Ghanim's quadrilogy al-Rajul alladhi faqada zillahu.
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