The Collaborative International Dictionary of English v.0.48:

Semi-Pelagian \Sem`i-Pe*la"gi*an\, a.
   Of or pertaining to the Semi-Pelagians, or their tenets.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Semi-Pelagian \Sem`i-Pe*la"gi*an\, 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]