In early Christian church architecture, the outermost vestibule or entrance hall before the narthex, where unbaptized people or penitents stood.
From Greek 'exo-' (outside) + 'narthex' (vestibule, entrance), this architectural term describes the physical space that reflected spiritual hierarchy in early churches.
Early churches literally built theology into their floor plans—the further back in the church you could go, the more 'in' you were spiritually. The exonarthex was the waiting room for those not yet fully inside the faith.
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