n.
Pronunciation: te- ' trä-l ə -j ē , - ' tra-
Function: noun
Inflected Form: plural -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)