Synonyms for Chalcedon (same or very similar meaning)
WordNet sense 1 (a former town on the Bosporus (now part of Istanbul); site of the Council of Chalcedon):
KadikoyWordNet sense 2 (the fourth ecumenical council in 451 which defined the two natures (human and divine) of Christ):
Council of ChalcedonFrom the ODE community, based on WordNetadd/edit