Scission.
ETYM Old Eng. scisme, Old Fren. cisme, scisme, French schisme, Latin schisma, Greek schisma, from schizein to split; akin to Latin scindere, Skr. chid, and prob. to Eng. shed, v.t (which see); cf. Rescind, Schedule, Zest.
Division of a group into opposing factions; SYN. split.
Division, especially of church, into two parties.
Formal split over a doctrinal difference between religious believers, as in the Great Schism in the Roman Catholic Church; over the doctrine of papal infallibility, as with the Old Catholics in 1879; and over the use of the Latin Tridentine Mass 1988.