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In architecture, any division of a building between vertical lines or planes, especially the entire space included between the centerlines of two adjacent vertical supports. The space between two columns or pilasters, or from pier to pier in a church, including that part of the vaulting (seevault) or ceiling between them, is thus called a bay.
This entry comes from Encyclopædia Britannica Concise. For the full entry on bay, visit Britannica.com.