What is "western schism"

Schism \Schism\, n. [OE. scisme, OF. cisme, scisme, F. schisme, L. schisma, Gr. schi`sma, fr. schi`zein to split; akin to L. scindere, Skr. chid, and prob. to E. shed, v.t. (which see); cf. Rescind, Schedule, Zest.] Division or separation; specifically (Eccl.), permanent division or separation in the Christian church; breach of unity among people of the same religious faith; the offense of seeking to produce division in a church without justifiable cause.

Set bounds to our passions by reason, to our errors by truth, and to our schisms by charity.
--Eikon Basilike.

Greek schism (Eccl.), the separation of the Greek and Roman churches.

Great schism, or Western schism (Eccl.) a schism in the Roman church in the latter part of the 14th century, on account of rival claimants to the papal throne.

Schism act (Law), an act of the English Parliament requiring all teachers to conform to the Established Church, -- passed in 1714, repealed in 1719.

The Western Schism or Papal Schism was a split within the Roman Catholic Church which lasted from 1378 to 1417. Three men simultaneously claimed to be the true pope. Driven by politics rather than any theological disagreement, the schism was ended by the Council of Constance (1414–1418). For a time these rival claims to the papal throne damaged the reputation of the office. The affair is sometimes referred to as the Great Schism, although this term is typically reserved for the East–West Schism (1054) between the Western Churches answering to the See of Rome and the Orthodox Churches of the East.