Wiktionary
covenstead
n. 1 (context Wicca English) A permanent circle or temple used to meet for rituals and to store religious items, often a mundane location. 2 (context Wicca by metonymy English) A Wiccan congregation.
Wikipedia
Covenstead
A covenstead is a building or area that a witchcraft coven (or church) has designated as their permanent ritual area. In addition to a building owned by the coven, this ritual space can be a room in the home of the High Priestess or other coven member, a rented space, a public park or other outdoor location, land belonging to the coven, or even an astral temple.