sometimes capitalized: an adherent or proponent of Protestant fundamentalism
2
: an extreme conservative
especially: one who attacks any deviation from certain doctrines and practices he considers essential (as to a religious, political, or educational system)
a political fundamentalist … could reduce the shadings of any political controversy into a black-and-white conflict between free enterprise and socialism —Time
3
often capitalized: a member of a small dissident Mormon sect continuing to practice polygamy after its outlawry in 1890
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