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Chalcedon

city in Bithynia, opposite Constantinople, site of an important Church council (451),  from Phoenician, literally "new town." 

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Definitions of Chalcedon from WordNet

Chalcedon (n.)
a former town on the Bosporus (now part of Istanbul); site of the Council of Chalcedon;
Synonyms: Kadikoy
Chalcedon (n.)
the fourth ecumenical council in 451 which defined the two natures (human and divine) of Christ;
Synonyms: Council of Chalcedon
From wordnet.princeton.edu