From WordNet (r) 3.0 (2006) [wn]:
piazza
n 1: a public square with room for pedestrians; "they met at Elm
Plaza"; "Grosvenor Place" [syn: plaza, place, piazza]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Piazza \Pi*az"za\, n.; pl. Piazzas. [It., place, square,
market place, L. platea street, courtyard. See Place.]
An open square in a European town, especially an Italian
town; hence (Arch.), an arcaded and roofed gallery; a
portico. In the United States the word is popularly applied
to a veranda.
[1913 Webster]
We walk by the obelisk, and meditate in piazzas. --Jer.
Taylor.
[1913 Webster]