noun

1. a split or division in an organized group or society, esp. a church, as the result of difference of opinion, of doctrine, etc.
2. the act of causing or trying to cause a split or division in a church
3. any of the sects, parties, etc. formed by such a split

Etymology: ME scisme < OFr cisme < LL(Ec) schisma < Gr < schizein, to cleave, cut: see schizo-