Open square or marketplace, surrounded by buildings, in an Italian town or city.
It was equivalent to the plaza of Spanish-speaking countries. The term became more widely used in the 16th–18th century, denoting any large open space with buildings around it. In 17th–18th-century Britain, long covered walks or galleries with roofs supported by columns were called piazzas; in the U.S. in the 19th century, piazza was another name for a veranda formed by projecting eaves.