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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.
During the events of Schism, Shadowcat argues with Colossus that he belongs at Westchester Academy, not at Utopia. Colossus explains that he is not remaning on Utopia out of obligation to his sister, Magik, rather he is scared of his power and what harm he could do to the students at the Academy.