KOINE, a type of dialect (a regional variety of a language) [n]
amalgam of Greek dialects, chiefly Attic and Ionic, that replaced the Classical Greek dialects in the Hellenistic period and flourished under the Roman Empire
lingua franca
the Greek language commonly spoken and written in eastern Mediterranean countries in the Hellenistic and Roman periods
dialect or language of a region that has become the common or standard language of a larger area
KOINE, a type of dialect (a language peculiar to a region) [n]