Noun
A group or series of four dramatic pieces, three tragedies and one satyric, or comic, piece (or sometimes four tragedies), represented consequently on the Attic stage at the Dionysiac festival.
Source: Webster's dictionaryI thought 'UnSouled' would come in at around 400 pages, but it took 650 pages, and even then I felt like I was rushing the conclusion, so I asked my editor and publisher if I could divide it again. So a sequel became a trilogy, and the trilogy became a tetralogy - although we're not calling it that. Neal Shusterman
In his tetralogy called Word Studies in the New Testament, the 19th century theologian Marvin Vincent wrote: Aion, transliterated aeon, is a period of longer or shorter duration, having a beginning and an end, and complete in itself. Source: Internet
The tetralogy Joseph and His Brothers is an epic novel written over a period of sixteen years, and is one of the largest and most significant works in Mann's oeuvre. Source: Internet
The titles of the volumes signal a tetralogy in one vegetational cycle, which regulates the eternal and repeatable rhythm of village life. Source: Internet