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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.
Roman Catholic Answer. The Eastern schism was when the Orthodox Church separated from the Catholic Church, it did not split into two churches, the Church remained, the Orthodox left. Jesus established His Church and said (and prayed) that it would be one.