solifidian, sol-i-fid′i-an, n. one who holds that faith alone is what is necessary for justification.
"one who believes in salvation by faith alone" (based on Luther's translation of Rom. iii:28), 1590s, Reformation coinage from Latin solus "alone" (see sole (adj.)) + fides "faith" (see faith). As an adjective from c.1600. Related: Solifidianism