Term applied to plays of an experimental or unorthodox nature which attempt to go beyond standard usage in form, content, or both.
Chorus
(1) In ancient Greek drama, a group of performers who sang and danced, sometimes participating in the action but usually simply commenting on it. (2) Performers in a musical play who sing and dance as a group rather than individually.
Exposition
Imparting of information that is necessary for an understanding of the story but will not be covered by the action onstage: events or knowledge from the past, or occurring outside the play, which must be introduced if the audience is to understand the characters or the plot. Exposition is almost always a challenge in drama because relating or conveying information is static; the dramatist must find ways to make expository scenes dynamic.
Ritual
Specifically ordered, ceremonial religious, personal, or social event.
Well-made play
Type of play popular in the nineteenth and early twentieth century which combined apparent plausibility of incident and surface realism with a tightly constructed and contrived plot.