protestantism Meaning, Definition & Usage

  1. noun the theological system of any of the churches of western Christendom that separated from the Roman Catholic Church during the Reformation

WordNet

Prot"es*tant*ism noun
Etymology
Cf. F. protestantisme.
Definitions
  1. The quality or state of being protestant, especially against the Roman Catholic Church; the principles or religion of the Protestants.

Webster 1913