The side aisle in medieval architecture was significant as it provided additional space for worshipers to move around during religious services. It offered a separate space for processions and also provided access to the chapels located on each side. The side aisles were also used for various religious practices such as burials, baptisms, confessionals, and as places to display relics. Furthermore, the side aisle played an important role in the structure of the building, as it supported the weight of the vaults and the roof, creating a more stable and durable construction.
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