noun, plural autochthons, autochthones [aw-tok-thuh-neez] .
an aboriginal inhabitant.
Ecology. one of the indigenous animals or plants of a region.
Geology. a geological formation formed in the region where found.
Compare allochthon.

1640–50; < Greek autóchthōn of the land itself, equivalent to auto- auto-1 + chthṓn the earth, land, ground Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
autochthon (ɔːˈtɒkθən, -θɒn)
n , pl -thons, -thones
1.  (often plural) one of the earliest known inhabitants of any country; aboriginal
2.  an animal or plant that is native to a particular region
[C17: from Greek autokhthōn from the earth itself, from auto- + khthōn the earth]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1640s, "one sprung from the soil he inhabits" (pl. autochthones), from Gk. autokhthon "aborigines, natives," lit. "sprung from the land itself," used of the Athenians and others who claimed descent from the Pelasgians, from auto- "self" (see auto-) + khthon "land, earth, soil" (see chthonic).
Online Etymology Dictionary, © 2010 Douglas Harper
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