spec. A private oratory or place of worship. A room or building for private worship in or attached to a palace, nobleman's house, castle…

A private chapel, or reserved area of a church, for the use of a lord, monarch, etc.; (also) a private pew. Obsolete.

The part of a Roman house where the images of Lares or household gods were kept; hence, a private shrine or chapel.

A place of public worship of the established Church, subordinate to, or dependent upon, the church… proprietary chapel: one that is the property of…