proper noun/plɛ.zɑ̃s/
a surname; Piacenza (a province of Emilia-Romagna, Italy); Piacenza (the capital city of the province of Piacenza, Emilia-Romagna, Italy); a municipality of Papineau Regional County Municipality, Outaouais, Quebec, Canada
Related: Plaisancien, Plaisancienne
Derived from plaisance (“pleasure”), either as a reference to the pleasant surroundings of the municipality or as a reference to one of several locales in France. The Italian city is derived from the Latin Placentia, from placentia < placēns (“pleasing, welcoming”).