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From The Collaborative International Dictionary of English v.0.48:
Nicolaitan \Ni`co*la"i*tan\ (n[i^]k`[-o]*l[=a]"[i^]*tan), n. [So called from Nicolas of Antioch, mentioned in Acts vi. 5.] (Eccl. Hist.) One of certain corrupt persons in the early church at Ephesus, who are censured in Rev. ii. 6, 15. [1913 Webster]