The Collaborative International Dictionary
Pelagianism \Pe*la"gi*an*ism\, n. [Cf. F. p['e]lagianisme.] The doctrines of Pelagius.
Wikipedia
Pelagianism is the belief that original sin did not taint human nature and that mortal will is still capable of choosing good or evil without special divine aid. This theological theory is named after the British monk Pelagius (354–420 or 440), although he denied, at least at some point in his life, many of the doctrines associated with his name. Pelagius taught that the human will, as created with its abilities by God, was sufficient to live a sinless life, although he believed that God's grace assisted every good work. Pelagianism has come to be identified with the view (whether taught by Pelagius or not) that human beings can earn salvation by their own efforts.
Usage examples of "pelagianism".
Was Pelagianism a new form of Gnosticism, or was it merely Arianism in disguise?
My endeavors to show that Christianity was in harmony with reason, were mistaken for an attempt to substitute reason for faith, and became the occasion of a rumor that I was running into Pelagianism or Socinianism.
One account of it says that the manuscript leans toward Sabellianism, and that it even approaches Pelagianism.