Koine

noun

1. a Greek dialect that flourished under the Roman Empire

   noun.communication

   Source: WordNet 3.0

2. a common language used by speakers of different languages

   noun.communication

   Examples

   Koine is a dialect of ancient Greek that was the lingua franca of the empire of Alexander the Great and was widely spoken throughout the eastern Mediterranean area in Roman times.

   Synonyms interlanguage lingua franca

   Source: WordNet 3.0