(often capitalized) In the New York City area, a small theater with fewer than 300 seats, or a production in such a theater, usually away from the "Broadway" theater district, which operates under special rules from the theatrical unions and permits mounting productions at a much lower cost.

Of or pertaining to an off-Broadway theater, or a production mounted in one.

plural of off-Broadway

(often capitalized) A New York City area off-Broadway-style show, but not operating under the aegis of the theatrical unions. These are generally very low budget, with limited casts and even more limited production values, performed in unconventional, ad hoc spaces.

Of or pertaining to an off-off-Broadway production.

plural of off-off-Broadway

(sometimes humorous) A theatrical production performed in spaces remote from Manhattan, but nonetheless in the greater New York City area, and which otherwise fits the description of an off-off-Broadway show.

Of or pertaining to an off-off-off-Broadway production, or to the space they are performed in.

plural of off-off-off-Broadway