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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 Great Schism, also known as the East-West Schism, was the event that divided Chalcedonian Christianity into Western (Roman) Catholicism and Eastern Orthodoxy.^[1]^ Though normally dated to 1054, when Pope Leo IX and Patriarch Michael I excommunicated each other, the East-West Schism was actually the result of an extended period of estrangement ...