The Scientific Method—an ordered approach for determining the validity of a hypothesis, relying on data/experiments to make a very specific conclusion
Index (not to be confused with “index” in the back of a book)—a list of Church-prohibited books
Inquisition (literally “that which enquires into”)—an organization associated with the Church that investigated possible “heretics,” those who claimed to practice the Catholic faith but actually betrayed that faith—the most powerful branches of the Inquisition were in Spain and in Italy