A local dialect or language that becomes commonly used in a wider area, after it has lost its very specific local characteristics.
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In Macedonia, Koine was strictly the language of the educated and was used by the court administrators and the international merchants.
While Koine served its purpose in the administrative and commercial circles, other languages, languages of the people, simultaneously also flourished in parallel but in their oral form until they were later codified by Christianity.
Koine evolved as the language of administration and commerce in the entire Eastern Mediterranean and as such belongs to all the people in the Eastern Mediterranean world.