Definify.com
Webster 1913 Edition
Trilogy
Tril′o-gy
,Noun.
A series of three dramas which, although each of them is in one sense complete, have a close mutual relation, and form one historical and poetical picture. Shakespeare’s “ Henry VI.” is an example.
On the Greek stage, a drama, or acted story, consisted in reality of three dramas, called together a
trilogy
, and performed consecutively in the course of one day. Coleridge.