The native, indigenous people of a country are often called aboriginals. In Canada, the First Nations — Inuits and Métis — would be considered aboriginals.
The adjective form of aboriginal is used to describe anything related to the people native to an area. You may visit a museum that has an exhibit of aboriginal art; or, if you're a linguist, you may study aboriginal languages. The adjective can also be used to describe something that is indigenous to a place and existed there from the beginning, such as "an aboriginal forest" that consists of old, old trees.
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