dilogy
/daɪˈlɒdʒi/Definitions
1. noun
A series of two related works of fiction, especially novels or films, that together tell a complete story.
“The author’s trilogy and dilogy are highly acclaimed for their intricate plotlines.”
2. noun
A pair of closely related works of art, music, or literature.
“The composer’s dilogy for piano and orchestra is considered a masterpiece of modern music.”