1. (n.) A follower of John Cassianus, a French monk (died about 448), who modified the doctrines of Pelagius, by denying human merit, and maintaining the necessity of the Spirit's influence, while, on the other hand, he rejected the Augustinian doctrines of election, the inability of man to do good, and the certain perseverance of the saints.

2. (a.) of or pertaining to the Semi-Pelagians, or their tenets.