Source : Webster's Revised Unabridged Dictionary (1913)

Nicolaitan \Ni`co*la"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.