Existing where it was formed or born; native, aboriginal, indigenous(adjective)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "autochthonal" in a sentence
"The Church had no illusions about the enormous task of converting the entire autochthonal population of that hostile moon to the saving grace of the Divine."
"Anymore than building a city on land that was previously only being used for seasonal hunting bestows autochthonal precedent on that city's inhabitants."
"We passed Cabul merchants peddling their dried fruit on shaggy-haired camels; to these succeeded, in more lonesome portions of the road, small groups of Korkas, wretched remnants of one of the autochthonal families of Central India -- even lower in the scale of civilization than the Gónds, among whom they are found; and to these the richly-caparisoned elephants of some wealthy"