WordNet (r) 3.0 (2006):

Nicaea
    n 1: an ancient city in Bithynia; founded in the 4th century BC
         and flourished under the Romans; the Nicene Creed was
         adopted there in 325
    2: the seventh ecumenical council in 787 which refuted
       iconoclasm and regulated the veneration of holy images [syn:
       Nicaea, Second Council of Nicaea]
    3: the first ecumenical council in 325 which produced the
       wording of the Nicene Creed and condemned the heresy of
       Arianism [syn: Nicaea, First Council of Nicaea]