1
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
: of, adhering to, or marked by fundamentalism
comparing the neoorthodox with the fundamentalist position a fundamentalist revival preacher an economic outlook strongly fundamentalist in tone
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Merriam-Webster unabridged
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