First Council of Nicaea

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Noun1.First Council of Nicaea - the first ecumenical council in 325 which produced the wording of the Nicene Creed and condemned the heresy of Arianism
ecumenical council - (early Christian church) one of seven gatherings of bishops from around the known world under the presidency of the Pope to regulate matters of faith and morals and discipline; "the first seven councils through 787 are considered to be ecumenical councils by both the Roman Catholic church and the Eastern Orthodox church but the next fourteen councils are considered ecumenical only by the Roman Catholic church"
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Eight occurred during the first millennium of Christianity, including two in the fourth century: the first Nicean Council (325) and the First Council of Constantinople (381).

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