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an act of the English Parliament requiring all teachers to conform to the Established Church, -- passed in 1714, repealed in 1719.