Plural of deambulatory; covered walkways or corridors in a church or building designed for walking or processions.
From Late Latin deambulatorium, derived from de- (thoroughly) + ambulare (to walk). The suffix -ory indicates a place or function. This term evolved in ecclesiastical architecture to describe the processional pathways around cathedral interiors.
Medieval cathedrals often had deambulatories so clergy could walk in solemn procession without disturbing worshippers—they're basically the spiritual equivalent of a building's circulation system, designed for both function and ceremony.
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