A semicircular or polygonal recess in a church, typically located at the eastern end behind the altar. The apse often features a domed or vaulted ceiling and serves as the focal point for the most sacred elements of the church.
From Latin 'apsis,' borrowed from Greek 'hapsis' meaning 'arch' or 'vault.' Originally used in Roman architecture for the curved end of a basilica, the form was adopted by early Christians for their places of worship.
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