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An arched srtucture or a semi-circular end of a wall. In byzantine architecture it means the semicircular, usually barrel-vaulted, niche at the east end of a basilica. The side aisles of a basilica may also end in an apse, but it is always in the central apse where the altar is placed. It was separated from the main church by a barrier, the templon, or the iconostasis. Its ground plan on the external side could be semicircular, rectangular or polygonal.

atrium
1. Antiquity: The large, open space within a building, which is envelopped by colonnades.2. Βyzantium: The forecourt of a church in early Christian, Byzantine, and medieval arcitecture. It was usually surrounded by four porticoes (quadriporticus).

cistern
A receptacle for holding rainwater, but also water transported from elsewhere, in order to keep it stored. The cisterns were either covered eiter open, and they could have more than one compartements.

curiales
Curiales were the members of the city councils (gr.: boule) in the late Roman Empire. They belonged to the local aristocracy and were officials of the municipal administration, responsible for the normal functioning of the city's institutions as well as for local tax-collecting. A city's boule could count from 100 to 200 curiales, depending on the city's population.

martyrion
(pl. martyria) Shrine or building over the grave or the place of martyrdom of a martyr.