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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.
What is called the Great Schism in the Catholic Church was the Western Schism, which, even more confusing, was not really a schism in the sense that the Schism of the East was, but a time when the Church had more than one claimant to the Papal Throne, finally resulted in three, one pope and two antipopes.