piazza Syllabification: (pi·az·za)Translate piazza | into Italian Definition of piazza noun 1 /pēˈätsə/ a public square or marketplace, especially in an Italian town. 2 /pēˈazə/ US archaic the veranda of a house. Origin: late 16th century: Italianpiazza in other Oxford dictionaries Definition of piazza in the British & World English dictionary