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From The Collaborative International Dictionary of English v.0.48:
Unbeliever \Un`be*liev"er\, n. 1. One who does not believe; an incredulous person; a doubter; a skeptic. [1913 Webster] 2. A disbeliever; especially, one who does not believe that the Bible is a divine revelation, and holds that Christ was neither a divine nor a supernatural person; an infidel; a freethinker. [1913 Webster] Syn: See Infidel. [1913 Webster]