The Collaborative International Dictionary of English v.0.48:

Anabaptism \An`a*bap"tism\, n. [L. anabaptismus, Gr.
   'anabaptismo`s: cf. F. anabaptisme. See Anabaptize.]
   The doctrine of the Anabaptists.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Anabaptism
    n 1: a Protestant movement in the 16th century that believed in
         the primacy of the Bible, baptised only believers, not
         infants, and believed in complete separation of church and
         state