DICT.TW Dictionary Taiwan

 tril·o·gy /ˈtrɪləʤi/
 三部劇,三部曲

 Tril·o·gy n.  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.
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 trilogy
      n : a set of three literary or dramatic works related in subject
          or theme