Main Entry:

tril·o·gy

Pronunciation:

\ˈtri-lə-jē\

Function:

noun

Inflected Form(s):

plural tril·o·gies

Etymology:

Greek trilogia, from tri- + -logia -logy

Date:

circa 1661

: a series of three dramas or literary works or sometimes three musical compositions that are closely related and develop a single theme