monsignor UK /mɒnˈsiː.njə/US /mɑnˈsiː.njɚ/ noun1 •An ecclesiastic title bestowed on some Roman Catholic clerics by the Pope.He wore the dress of an abbot and was accompanied by two monsignori in simple black. […] It was a letter from Monsignor Chatrousse, the Bishop of Valence in France. — 1955 formsMonsignori · Monsignors · monsignori · monsignors