SchismFrom The Hutchinson Unabridged Encyclopedia
Formal split over a doctrinal difference between religious believers, as in the final schism between the Roman Catholic and Eastern Orthodox churches in 1054; the Great Schism (1378-1417) in the Roman Catholic Church; the separation of the Old Catholics who rejected the doctrine of papal infallibility in 1879; and the schism over the use of the Latin Tridentine mass in 1988.