Etymology
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autochthonous (adj.)

"native, aboriginal, indigenous," 1805, from autochthon + -ous. The opposite is allochthonous.

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Definitions of autochthonous

autochthonous (adj.)
of rocks, deposits, etc.; found where they and their constituents were formed;
autochthonous (adj.)
originating where it is found;
autochthonous rocks and people and folktales
Synonyms: autochthonal / autochthonic / endemic / indigenous
From wordnet.princeton.edu