Final answer:
The name for the series of meetings of high Roman church officials is the ecumenical councils, particularly the Council of Trent, which played a vital role in defining Roman Catholic belief and practice during the Reformation.
Step-by-step explanation:
The series of meetings of high Roman church officials that resulted in a statement of Roman Catholic belief and practice were known as ecumenical councils. The most notable of these during the time of the Protestant Reformation was the Council of Trent. Running from 1545 to 1563, the Council of Trent addressed various doctrines and practices in response to the challenges posed by the Reformation. It affirmed the Doctrine of Merit, the existence of Purgatory, the importance of all seven sacraments, the necessity of religious art, and the authority of both scripture and church teachings. These decisions played a major role in defining Roman Catholic theology well into the modern era.