Basilica

The Latin word basilica (derived from Greek βασιλικὴ στοά, lit. "royal stoa", serving as the tribunal chamber of a king) has three distinct applications in modern English. The word was originally used to describe an ancient Roman public building where courts were held, as well as serving other official and public functions. To a large extent these were the town halls of ancient Roman life. The basilica was centrally located in every Roman town, usually adjacent to the main forum. These buildings, an example of which is the Basilica Ulpia, were rectangular, and often had a central nave and aisles, usually with a slightly raised platform and an apse at each of the two ends, adorned with a statue perhaps of the emperor, while the entrances were from the long sides.

By extension the name was applied to Christian churches which adopted the same basic plan and it continues to be used as an architectural term to describe such buildings, which form the majority of church buildings in Western Christianity, though the basilican building plan became less dominant in new buildings from the later 20th century. Later, the term came to refer specifically to a large and important Roman Catholic church that has been given special ceremonial rights by the Pope.

Roman Catholic basilicas are Catholic pilgrimage sites, receiving tens of millions of visitors per year. In December 2009 the Basilica of Our Lady of Guadalupe in Mexico City set a new record with 6.1 million pilgrims during Friday and Saturday for the anniversary of Our Lady of Guadalupe.

The Roman basilica was a large public building where business or legal matters could be transacted. The first basilicas had no religious function at all. As early as the time of Augustus, a public basilica for transacting business had been part of any settlement that considered itself a city, used in the same way as the late medieval covered market houses of northern Europe, where the meeting room, for lack of urban space, was set above the arcades, however. Although their form was variable, basilicas often contained interior colonnades that divided the space, giving aisles or arcaded spaces on one or both sides, with an apse at one end (or less often at each end), where the magistrates sat, often on a slightly raised dais. The central aisle tended to be wide and was higher than the flanking aisles, so that light could penetrate through the clerestory windows.

...
Wikipedia