Definition of "fundamentalist"

One who reduces religion to strict interpretation of core or original texts.  examples

(finance) A trader who trades on the financial fundamentals of the companies involved, as opposed to a chartist or technician.  examples

(Christianity) Originally referred to an adherent of an American Christian movement that began as a response to the rejection of the accuracy of the Bible, the alleged deity of Christ, Christ's atonement for humanity, the virgin birth, and miracles.  examples

(derogatory) A fundamentalist Christian.  examples