triology

noun

Etymology: By alteration (influence of trio).

1. A trilogy.

   “Among the remaining pieces of Æschylus, we have what is highly deserving of our attention, a complete triology. The antiquarian account of triologies is this, that in the more early times the poet did not contend for the prize with a single piece, but with three, which however were not always connected together by their contents, and that a fourth satirical drama was also attached to them.”

   “Anthony Burgess’s Enderby triology is now a tetralogy, with a new volume “Composed to placate kind readers of The Clockwork Testament, or Enderby’s End, who objected to my casually killing my hero.””