Sentence:  A comedy in Three <WSD>Acts</WSD> '' , in which , under `` Personages '' , Henrietta appeared as `` A Schoolmarm '' , and Bertha , who was only a trifle less brilliant in high school than Henrietta had been , appeared as `` Dummkopf '' . 
Meaning of the word marked with <WSD> tags:  a subdivision of a play or opera or ballet