Question

Define pentology.

Answer 1

Wikipedia, sweetheart ;)

Pentalogy is a compound literary or narrative work that is explicitly divided into five (numerical prefix penta-) parts. Although modern use of the word implies both that the parts are reasonably self-contained and that the structure was intended by the author, historically, neither was necessarily true: in fact, a pentalogia could be assembled by a later editor,[1] just as Plotinus's Enneads were arranged in nines by Porphyry in order to create an overarching structure of six which would express the idea of perfection.