Etymology
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Protestantism (n.)

"state of being a Protestant; religious principles of Protestants," 1640s, from French protestantisme or else formed from Protestant + -ism. Meaning "Protestant Christians or churches" is from 1660s.

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Definitions of Protestantism

Protestantism (n.)
the theological system of any of the churches of western Christendom that separated from the Roman Catholic Church during the Reformation;
From wordnet.princeton.edu