Existing where it was formed or born; native, aboriginal, indigenous(adjective)
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Use "autochthonic" in a sentence
"F.ther F. Combes, S. J.,  says that the owners, that is, the autochthonic natives of Mindanáo, were called Manóbos and Mananápes. ["
"The massif is the largest Swiss autochthonic crystalline entity."
"Yet, American Romantic ideology, as it emerged in the Democratic Review through the use of civic nationalism and sentiment, fostered the notion that a radical split from Britain was not only aesthetically desired but also ideologically necessary if its literature was to appear as an original, inspired, and autochthonic thing."