chapter house

noun2

1. •
   A building attached to a cathedral, church, or monastery and used as a meeting place.

   • The cloister, and the chapter-house adjoining to the church, are the finest here of any I have seen in England; the latter is octagon, or eight-square, and is 150 feet in its circumference. — 1724
2. •
   A building used by a sorority or fraternity as a residence or meeting place.

   • At the house-party herein represented a murder is done, and the locale of the deed is a chapter house on the pleasant campus at Williamston, Mass. — 1929