koine
/ˈkɔɪniː/noun
mass noun
1- the common language of the Greeks from the close of the classical period to the Byzantine era柯因内语（古典时期结束到拜占庭时代的希腊共通语）。
1.1
- count noun a common language shared by various peoples; a lingua franca共通语; 混合语。
词源
late 19th cent.: from Greek koinē （dialektos） 'common (language)'.