trilogy
//ˈtrɪl.ə.dʒi//
Noun
trilogySingular
trilogiesPlural
1
A group of three related novels, plays, films, or other creative works that are connected by a common theme, characters, or storyline.
The Lord of the Rings trilogy is one of the most famous fantasy series in the world.
2
In ancient Greek theater, a series of three tragedies performed consecutively at a festival.
The Oresteia is the only complete trilogy from ancient Greek theater that has survived to this day.