a. [ L. pelagius, Gr. pela`gios, fr. pe`lagos the sea: cf. F. pélagien. ] Of or pertaining to the sea; marine; pelagic; as, pelagian shells. [ 1913 Webster ]

n. [ L. Pelagianus: cf. F. pélagien. ] (Eccl. Hist.) A follower of Pelagius, a British monk, born in the later part of the 4th century, who denied the doctrines of hereditary sin, of the connection between sin and death, and of conversion through grace. [ 1913 Webster ]

a. [ Cf. F. pélagien. ] Of or pertaining to Pelagius, or to his doctrines. [ 1913 Webster ]

n. [ Cf. F. pélagianisme. ] The doctrines of Pelagius. [ 1913 Webster ]

n. (Eccl. Hist.) 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. [ 1913 Webster ]

a. Of or pertaining to the Semi-Pelagians, or their tenets. [ 1913 Webster ]

n. The doctrines or tenets of the Semi-Pelagians. [ 1913 Webster ]