• Webster's Revised Unabridged Dictionary
    • n Semi-Pelagian (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.
    • a Semi-Pelagian Of or pertaining to the Semi-Pelagians, or their tenets.
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Chambers's Twentieth Century Dictionary
    • Semi-Pelagian relating to the theology of the Semi-Pelagians (John Cassianus, &c.), who tried to find a middle course between the Augustinian doctrine of predestination and the Pelagian doctrine of the free-will of man
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In literature:

You face the insinuations of the Pelagians and the semi-Pelagians.
"The Three Musketeers" by Alexandre Dumas, Pere
The semi-Pelagians held that man could turn to God by his own strength, but that divine grace was necessary to enable him to persevere.
"The Freethinker's Text Book, Part II." by Annie Besant
He was a semi-Pelagian; and so it appears was Fastidius, for whose soundness he vouches.
"The Christian Church in These Islands before the Coming of Augustine" by George Forrest Browne
The opinions of Arnobius, as appears from the commentary, are semi-Pelagian.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 6" by Various