The meaning of Colony in the Bible
(From Easton's Bible Dictionary)

The city of Philippi was a Roman colony (Acts 16:12), i.e., a military settlement of Roman soldiers and citizens, planted there to keep in subjection a newly-conquered district. A colony was Rome in miniature, under Roman municipal law, but governed by military officers (praetors and lictors), not by proconsuls. It had an independent internal government, the jus Italicum; i.e., the privileges of Italian citizens.

See more on the meaning of Colony in the Bible:
Colony {International Standard Bible Encyclopedia}

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