Abbey - a monastery where, either monks live, governed by an abbot, or in the case of nuns, governed by an abbess.
Aisle - passages flanking the nave and choir, separated from them by arcades.
Altar - originally a structure on which offerings to a god were placed, often for sacrifice. In the Christian church, the altar is often in the form of a stone table, can be elaborately carved, and containing relics.
Ambulatory - a roofed passageway, enclosing the apse, and linking the aisles which flank the nave.
Apse - a semicircular or polygonal extension to the chancel, usually vaulted.
Aumbry-a small recess or cupboard used to hold sacred vessels, most often in the thickness of the wall.
Cathedral - a Bishop's church, from cathedra, the bishop's chair, positioned behind the altar, in the centre of the apse.
Canon - a member of the chapter, the body who presides over a cathedral, or other important religious house.
Chancel/chancel arch - the continuation of the nave, east of the crossing, where the altar is placed. The chancel arch occurs where the chancel meets the crossing.
Chapel - most popularly applies to a private place of worship, but can be part of a church, where often, worship of a particular saint is implied.
Chapterhouse - the place where the governing body of a cathedral or monastery meets. Usually polygonal in plan they are adjacent or attached to the main church.
Choir - where divine service is sung, usually part of the chancel.
Clerestory (clearstorey) - the upper parts of the main walls of a church, pierced by windows.
Cloisters - an enclosed space, usually on the south side of the nave, connecting the church to the domestic parts of the monastery. Characterised by covered walkways.
Crossing - the area where the nave and choir intercept with the transepts.
Minster - originally the church of a monastry, then became used to describe any large church. Best known example, York Minster.
Monastery - a self contained, organised religious community, and the communal buildings around which the life of the inhabitants revolves.
Nave - the western limb of a church, where the congregation meets.
Reredos - a decorative screen situated to the rear of the altar.
Rood - a large crucifix (christ on the cross) usually over the entrance to the chancel. A rood tower or spire is one situated over the crossing.
Triforium - an arcaded wall passage, extending around a church between the ground floor arcade and the clerestory.