Noun koine has 2 senses
  1. Koine - a Greek dialect that flourished under the Roman Empire
    --1 is a kind of
    Greek, Hellenic, Hellenic language
  2. lingua franca, interlanguage, koine - a common language used by speakers of different languages; "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"
    --2 is a kind of language, linguistic communication
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