pius xi pius x • pius xii · · · Info · Definitions · Characters · · pius xi · · Text Common · · Latin · · Scripts 7 · · Length 3 · · Syllables Definitions · · · (noun) pope who signed a treaty with Mussolini recognizing the Vatican City as an independent state (1857-1939). Synonyms: Pius XI, Achille Ratti, Ambrogio Damiano Achille Ratti. · · Noun Definition 1 Characters · · space U+0020 i latin small letter i U+0069 p latin small letter p U+0070 s latin small letter s U+0073 u latin small letter u U+0075 x latin small letter x U+0078