Etymology
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schism (n.)

late 14c., scisme, sisme, cisme, "outward dissension within the church," producing two or more parties with rival authorities, from Old French scisme, cisme "a cleft, split" (12c.) and directly from Church Latin schisma, scisma (in Medieval Latin also cisma), from Greek skhisma (genitive skhismatos) "division, cleft," from stem of skhizein "to split"  (from PIE root *skei- "to cut, split").

The Greek word was applied metaphorically in the New Testament to divisions in the Church (I Corinthians xii.25), 

The classical spelling was restored 16c., but the pronunciation is unsettled. The general sense of "disunion, division, separation" is from early 15c. Historically, often in reference to the Great Schism (1378-1417) in the Western Church.

updated on January 30, 2022

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Definitions of schism from WordNet

schism (n.)
division of a group into opposing factions;
another schism like that and they will wind up in bankruptcy
Synonyms: split
schism (n.)
the formal separation of a church into two churches or the withdrawal of one group over doctrinal differences;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.