off Broadwayˌoff ˈBroadway adverb American English 
1(of theatre in New York) not in the main professional group of theatres, but more unusual or experimental in nature: 
His new play about life in a women's prison is opening off Broadway.2off-off Broadway more unusual, or perhaps extreme, than off Broadway—off-Broadway adjective: an off-Broadway production of Hamlet
1(of theatre in New York) not in the main professional group of theatres, but more unusual or experimental in nature: His new play about life in a women's prison is opening off Broadway.2off-off Broadway more unusual, or perhaps extreme, than off Broadway—off-Broadway adjective: an off-Broadway production of Hamlet