Protestantism

n. religious movement based on the teachings of Martin Luther, religious movement that separated from the Roman Catholic Church during the Reformation (comprised of several different denominations)

Protestantism encompasses the forms of Christian faith and practice that originated with the doctrines of the Reformation. The word Protestant is derived from the Latin protestatio meaning declaration which refers to the letter of protestation by Lutheran princes against the decision of the Diet of Speyer in 1529, which reaffirmed the edict of the Diet of Worms against the Reformation. Since that time, the term Protestantism has been used in many different senses, often as a general term to refer to "Western Christianity that is not subject to papal authority."
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Noun
1. the theological system of any of the churches of western Christendom that separated from the Roman Catholic Church during the Reformation
(hypernym) Christianity, Christian religion
(hyponym) predestinarianism

(n.)
The quality or state of being protestant, especially against the Roman Catholic Church; the principles or religion of the Protestants.
  

Protestantism