The term "Giovanni Vincenzo Pecci" refers specifically to an individual, not a common English word. Giovanni Vincenzo Pecci was an Italian pope, known as Pope Leo XIII, who served from 1878 to 1903. Here's an easy-to-understand explanation and some related information:
Giovanni Vincenzo Pecci, or Pope Leo XIII, was an influential pope known for his interest in education and making historical documents available to scholars.