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Full Definition of SCHISM. 1. 2. a: formal division in or separation from a church or religious body b: the offense of promoting schism. See schism defined for English-language learners.
The primary causes of the Schism were disputes over papal authority -- the Roman Pope claimed he held authority over the four Eastern patriarchs, while the four eastern patriarchs claimed that the primacy of the Patriarch of Rome was only honorary, and thus he had authority only over Western Christians -- and over the insertion of the filioque ...