ennealogy

plural ennealogies

1. rareA set of nine works of art that are connected, and that can be seen either as a single work or as nine individual works.

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

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

   2 more examples

   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.

   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, page 76

   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

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