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Byzantium

[bih-zan-shee-uh m, -tee-uh m]
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noun
  1. an ancient Greek city on the Bosporus and the Sea of Marmara: Constantine I rebuilt it and renamed it Constantinople a.d.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for byzantium

Byzantium

noun
  1. an ancient Greek city on the Bosporus: founded about 660 bc; rebuilt by Constantine I in 330 ad and called Constantinople; present-day Istanbul
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for byzantium

Byzantium

said to be named for its 7c. B.C.E. Greek founder, Byzas of Megara.

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Online Etymology Dictionary, © 2010 Douglas Harper