Act: A major division in a play. Often, individual acts are divided into smaller units (scenes') that all take place in a specific location. Originally, Greek plays were not divided into acts. They took place as a single whole interrupted occasionally by the chorus's singing. In Roman times, a five-act structure first appeared based upon Horace's recommendations. This five-act structure became a convention of drama (and especially tragedy) during the Renaissance. (Shakespeare's plays have natural divisions that can be taken as the breaks between acts as well, later editors inserted clear 'act' and 'scene' markings in these locations.) From about 1650 CE onward, most plays followed the five-act model. In the 1800s, Ibsen and Chekhov favored a four-act play, and in the 1900s, most playwrights preferred a three-act model, though two-act plays are not uncommon.

 

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