The noun "colony" has a couple of meanings. One is a country, region or group of countries under the control of another (more powerful) country. Another meaning is a group of living organisms of the same kind, such as ants.

Example sentences with colony, and its other word forms, are as follows.

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Malaysia is a former colony of Britain.
There is a huge colony of ants on the forest floor.

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colonial - adjective
The Sultan Abdul Samad building in Kuala Lumpur once housed the offices of the British colonial administration.

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colonise / colonize - verb
When Zheng He and his armada sailed from China, they were on diplomatic missions. When the Portuguese, Spanish, Dutch and British sailed the seas, they conquered and colonised other nations.

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Koloni atau tanah jajahan merupakan kawasan atau negara yang dijajah / ditakluk / diperintah oleh kuasa atau negara lain. Contohnya, negara Malaysia merupakan bekas tanah jajahan British.