• (RP) IPA: /ɔːˈtɒkθ(ə)n/, /ɔːˈtɒkθɒn/
  • (GA) IPA: /ɔˈtɑkθ(ə)n/, /ɔˈtɑkˌθɑn/, /ɑˈtɑkθ(ə)n/, /ɑˈtɑkˌθɑn/

autochthon (plural autochthons)

  1. The earliest inhabitant of an area; an aborigine.
  2. (geology) A large mass of rock in the place of its original formation, root#Verb|rooted to its basement (foundation rock) as opposed to an allochthon or nappe which has shift#verb|shifted from the place of formation; an autochthonous rock formation.
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