Tril″o‐gy (?), n. [Gr. τριλογία; pref. τρι- (see Tri-) + λόγοσ speech, discourse: cf. F. trilogie.] 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.