Wordnet 3.0
NOUN (1)
1. 
 the Roman Catholic doctrine of Cornelis Jansen and his disciples; 
 salvation is limited to those who are subject to supernatural determinism and the rest are assigned to perdition; 
The Collaborative International Dictionary of English v.0.48:
Jansenism \Jan"sen*ism\, n. [F. Jans['e]nisme.] (Eccl. Hist.)
   The doctrine of Jansen regarding free will and divine grace.
   [1913 Webster]
WordNet (r) 3.0 (2006):
Jansenism
    n 1: the Roman Catholic doctrine of Cornelis Jansen and his
         disciples; salvation is limited to those who are subject to
         supernatural determinism and the rest are assigned to
         perdition