ennealogy

ennealogy (plural ennealogies)

1. (rare) A set of nine works of art that are connected, and that can be seen either as a single work or as nine individual works.
   • 1992, Andrew Lawrence Markus (English quoter), August Pfizmaier (German author), “Über den Text eines japanischen Drama’s” (1870), page 115, quoted in The Willow in Autumn: Ryūtei Tanehiko, 1783-1842, Harvard University Asia Center, →ISBN, page 76:

     These works […] appear, upon closer scrutiny, to be dramatic, and are actually the seventh and eighth parts of an “ennealogy” (as it were), perhaps “polylogy,” for dramas in Japan frequently are protracted to such lengths.

   • 2009, Roger Cooke, Review of Naming Infinity‎, page 11:

     […] George Passant, the protagonist of C.P. Snow’s second novel in the Strangers and Brothers ennealogy […]

   • 2011, Ralph Raab, The Tamerlane Trap, iUniverse, page 1:

     Of course, nobody in their right mind would want to commit to an octalogy, ennealogy, or decalogy—or even more!— unless you were a fan of, say, Lemony Snicket

• dilogy (2)
• trilogy (3)
• tetralogy (4)
• pentalogy (5)
• hexalogy (6)
• heptalogy (7)
• octalogy (8)
• decalogy (10)
• polylogy (2+)