A member of the indigenous people of a region; an original inhabitant. The autochthons of the island have lived there for thousands of years, long before any settlers arrived.
Geology: A rock mass, geological formation, or structural block that has remained in its original position since its formation. The Precambrian autochthon lies beneath the thrust sheet untouched by tectonic transport.
A plant or animal that is native to the region in which it is found. The quokka is an autochthon of Western Australia.