Council of Chalcedon

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Noun1.Council of Chalcedon - the fourth ecumenical council in 451 which defined the two natures (human and divine) of Christ
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"