The indigenous flora and fauna of a region; see native species
A sediment or rock that can be found at its site of formation or deposition, as opposed to an allochthon, which has moved from that site
Autochtoon, a term in Dutch: a native-born citizen of the Netherlands or Flanders whose parents were also native-born, as opposed to an allochtoon, whose parents were not native-born.
Autochthon (Exalted), a Primordial deity in White Wolf's role playing game Exalted.
Autochthon Wurm, a card from Wizard of the Coast's Magic: the Gathering Trading Card Game.
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