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From The Collaborative International Dictionary of English v.0.48:
Nicene \Ni"cene\, a. [L. Nicaenus, fr. Nicaea Nice, Gr. ?.] Of or pertaining to Nice, a town of Asia Minor, or to the ecumenical council held there a. d. 325. [1913 Webster] Nicene Creed, a summary of Christian faith, composed and adopted by the Council of Nice, against Arianism, a. d. 325, altered and confirmed by the Council of Constantinople, a. d. 381, and by subsequent councils. [1913 Webster]