"allochthon" meaning in English

{
  "etymology_text": "1940-45; back formation from allochthonous.",
  "forms": [
    {
      "form": "allochthons",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "allochthon (plural allochthons)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Geology",
          "orig": "en:Geology",
          "parents": [
            "Earth sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A geological formation not formed in the region where found and moved to its present location by tectonic forces. Compare autochthon."
      ],
      "id": "en-allochthon-en-noun-l5NZDQji",
      "links": [
        [
          "geology",
          "geology"
        ],
        [
          "autochthon",
          "autochthon"
        ]
      ],
      "raw_glosses": [
        "(geology) A geological formation not formed in the region where found and moved to its present location by tectonic forces. Compare autochthon."
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/əˈlɒkθən/"
    },
    {
      "ipa": "/əˈlɒkθɒn/"
    }
  ],
  "word": "allochthon"
}

{
  "etymology_text": "1940-45; back formation from allochthonous.",
  "forms": [
    {
      "form": "allochthons",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "allochthon (plural allochthons)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "Pages with 2 entries",
        "en:Geology"
      ],
      "glosses": [
        "A geological formation not formed in the region where found and moved to its present location by tectonic forces. Compare autochthon."
      ],
      "links": [
        [
          "geology",
          "geology"
        ],
        [
          "autochthon",
          "autochthon"
        ]
      ],
      "raw_glosses": [
        "(geology) A geological formation not formed in the region where found and moved to its present location by tectonic forces. Compare autochthon."
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/əˈlɒkθən/"
    },
    {
      "ipa": "/əˈlɒkθɒn/"
    }
  ],
  "word": "allochthon"
}