Protestantism

from WordNet (r) 3.0 (2006)

Protestantism
    n 1: the theological system of any of the churches of western
         Christendom that separated from the Roman Catholic Church
         during the Reformation

from The Collaborative International Dictionary of English v.0.48

Protestantism \Prot"es*tant*ism\, n. [Cf. F. protestantisme.]
   The quality or state of being protestant, especially against
   the Roman Catholic Church; the principles or religion of the
   Protestants.
   [1913 Webster]