polylogy

poly- +‎ -logy

polylogy (usually uncountable, plural polylogies)

1. (rare) A set of two or more works of art that are connected, and that can be seen either as a single work or as individual works. They are commonly found in literature, film, or video games.
   • 1871 August Pfizmaier

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

2. (rare) Talkativeness.

• dilogy (2)
• trilogy (3)
• tetralogy (4)
• pentalogy (5)
• hexalogy (6)
• heptalogy (7)
• octalogy (8)
• ennealogy (9)
• decalogy (10)

• polylogy in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.