chapter house

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A building in which the chapter of a church or religious residence assembles.
2. n. A house in which a chapter of a fraternity or sorority lives and holds its meetings.

Century Dictionary and Cyclopedia

1. n. A building attached to a cathedral or religious house in which the chapter meets for the transaction of business. Chapter-houses are of different forms, some being parallelograms, some octagonal, and others decagonal. Many have a vestibule, and crypts are frequently found under them, chapter-houses serving not unfrequently as burial-places for clerical dignitaries. Many are among the most notable monuments of medieval architecture. See cut under cathedral.
2. n. The house or building which a chapter of a college fraternity uses as a club-house.

Wiktionary

1. n. A building attached to a cathedral, church, or monastery and used as a meeting place.
2. n. A building used by a sorority or fraternity as a residence or meeting place.

GNU Webster's 1913

1. n. a house or room where a chapter meets, esp. a cathedral chapter.

WordNet 3.0

1. n. a building attached to a monastery or cathedral; used as a meeting place for the chapter
2. n. a house used as a residence by a chapter of a fraternity