Koine

Words with a similar base: Koine

'Koine'

[koine.n.01] as in: a Greek dialect that flourished under the Roman Empire

'Koine'

[lingua_franca.n.01] as in: a common language used by speakers of different languages

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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