classis

noun, plural clas·ses [klas-eez] /ˈklæs iz/. (in certain Reformed churches)

1. the organization of pastors and elders that governs a group of local churches; a presbytery.
2. the group of churches governed by such an organization.

noun plural classes (ˈklæsiːz) (in some Reformed Churches)

1. a governing body of elders or pastors
2. the district or group of local churches directed by such a body