duology
nounUK /djuːˈɒlədʒi/
US /duːˈɑːlədʒi/
A duology is a set of two books or stories that go together.
My favorite duology tells the whole adventure in just two books.
RELATED WORDS
OTHER MEANINGS
2. A pair of related creative works, such as two films or two games, released as a set.
The director turned the story into a duology of films.
3. Any set of two things that are connected or considered together.
The two poems form a duology about the sea.
4. In music, a pair of linked compositions performed together.
The composer wrote a duology for piano and violin.