- (rare) # A set of seven works of art that are connected, and that can be seen either as a single work or as seven individual works. They are commonly found in literature, film, or video games.
- The Chronicles of Narnia by C. S. Lewis. In Search of Lost Time by Marcel Proust. Harry Potter by J. K. Rowling. The Dark Tower by Stephen King
From hepta- + -logy, in imitation of trilogy.