Pronunciation: (koi-nā', koi'nā), [key]
1. (usually cap.) an amalgam of Greek dialects, chiefly Attic and Ionic, that replaced the Classical Greek dialects in the Hellenistic period and flourished under the Roman Empire.
2. a lingua franca.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.