Main Entry: te·tral·o·gy

Pronunciation: \te-ˈträ-lə-jē, -ˈtra-\

Function: noun

Inflected Form(s): plural te·tral·o·gies

Etymology: Greek tetralogia, from tetra- + -logia -logy

Date: 1656

1 : a group of four dramatic pieces presented consecutively on the Attic stage at the Dionysiac festival
2 : a series of four connected works (as operas or novels)