ˈtriləjē, -ji noun
( -es )
Etymology: Greek trilogia, from tri- + -logia -logy
1. : a series of three dramas or sometimes three literary or musical compositions that although each is in one sense complete have a close mutual relation and form one theme or develop aspects of one basic concept
2. : a group of three connected classical Greek tragedies played serially (as at the festival of Dionysus)
3. : a group of three related things, topics, or sayings : triad