Porticus
A colonnade extending across one or more sides of a building
Porticus (plural porticus) is a Latin term referring to a covered, collonaded walkway extending across one or more sides of a building, or built freestanding - from which the English “portico” derives. Porticus, like many architectural types used throughout the classical world, were adopted by the Romans from the Greeks, and were used extensively throughout Roman architecture in both domestic and public settings. Some wealthier Romans had private porticus at their villae (country estates) or in city centers, sometimes connected to private horti (gardens) - though not to be confused with the peristylium (an open courtyard with columns on all four sides, usually with a hortus in the center). More often, porticus were built at the front or side of a public building to provide a shaded area for people to socialize, conduct business, or escape the heat. Most Roman temples (aedes) were built with a porticus at the front of the building that served as a covered entryway to the aedis. Many other public buildings in the Roman world would have porticus built extending along the sides of the building, which could be used to provide side entrances to a building, as shaded outdoor places to congregate, or simply as a shaded place for relaxation (Murray, 1875). Earlier Roman porticus seem to have been used more for business and legal purposes, but they appear to have taken on a more leisurely role going into the Imperial period (Platner & Ashby, 1929).
Bibliography
Latin Dictionary Entry
Porticus - Perseus Digital Library
Jay Brodzeller, 2022