trilogy

From English tri- +‎ -logy, from Latin trilogia, from Ancient Greek τριλογίᾱ (trilogíā, “trilogy”).

• IPA^(key): /ˈtɹɪləd͡ʒi/

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trilogy (plural trilogies)

1. A set of three works of art that are connected, and that can be seen either as a single work or as three individual works. They are commonly found in literature, film, or video games.
   • 22 March 2012, Scott Tobias, AV Club The Hunger Games

     That such a safe adaptation could come of The Hunger Games speaks more to the trilogy’s commercial ascent than the book’s actual content, which is audacious and savvy in its dark calculations.

• dilogy (2)
• tetralogy (4)
• pentalogy (5)
• hexalogy (6)
• heptalogy (7)
• octalogy (8)
• ennealogy (9)
• decalogy (10)
• polylogy (2+)