Roman Catholic AnswerTechnically the Narthex is the west end of the interior of a church of the Byzantine Rite, parted from the nave by a wall or screen. It corresponds to the narthex of the early Christian basilicas for the catechumens, penitents, and energumens (a demoniac or one possessed). It cannot properly be given to any form of western porch or ante-chapel in later Churches in the west, although I have heard it used to refer to the "gathering room" or reception area of a Church before you enter the nave.
Aisle
It is called the Narthex.
Narthex
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A rather imposing entrance to a building.
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They are all found in Churches. Basilica
To be used by penitents not admitted to the body of the Chirch
Narthex is an entrance area to a church. It begins with N.