/ Dictionary / Index B Byzantium: Meaning and Definition of Find definitions for: By•zan•ti•um Pronunciation: (bi-zan'shē-um, -tē-um), [key] — n. an ancient Greek city on the Bosporus and the Sea of Marmara: Constantine I rebuilt it and renamed it Constantinople a.d. 330. Cf. Istanbul. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: byzantium (Thesaurus) Byzantinist Byzas Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language