fun·da·men·tal·ism
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1. A usually religious movement or point of view characterized by a return to fundamental principles, by rigid adherence to those principles, and often by intolerance of other views and opposition to secularism.

2. often Fundamentalism An organized, militant Evangelical movement originating in the United States in the late 19th and early 20th century in opposition to Protestant Liberalism and secularism, insisting on the inerrancy of Scripture.