"ghost language" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "ghost town"
      },
      "expansion": "ghost town",
      "name": "m"
    }
  ],
  "etymology_text": "By analogy to ghost town.",
  "forms": [
    {
      "form": "ghost languages",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "ghost language (plural ghost languages)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "52 48",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "52 48",
          "kind": "topical",
          "langcode": "en",
          "name": "Linguistics",
          "orig": "en:Linguistics",
          "parents": [
            "Language",
            "Social sciences",
            "Communication",
            "Sciences",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "ref": "2000, Juliette Blevins, Nhanda: An Aboriginal Language of Western Australia (Oceanic linguistics special publication; 30), Honolulu: University of Hawai'i Press, page ix",
          "text": "Of the 250 or so Aboriginal languages once spoken in Australia, two-thirds are extinct or moribund. Coastal languages were usually the first to go, with settlement patterns matching patterns of extinction. In Western Australia, the former of approximately 110 Aboriginal languages, 45 were presumed extinct, and another 30 were on the verge of extinction. Wajuk, the original language of Perth, was dead. Nyungar, the language of the southwestern tip of the continent, was gone. Mirning, the language of Eucla, had disappeared with barely a trace. Witjaari, once spoken north of Wajuk, was now a ghost language. And the list went on. I had come to a land of linguistic devastation.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A language which has lost its speakers."
      ],
      "id": "en-ghost_language-en-noun-X~crwIDu",
      "links": [
        [
          "lost",
          "lose"
        ],
        [
          "speakers",
          "speakers"
        ]
      ],
      "synonyms": [
        {
          "word": "dead language"
        },
        {
          "word": "extinct language"
        }
      ]
    },
    {
      "categories": [
        {
          "_dis": "52 48",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "52 48",
          "kind": "topical",
          "langcode": "en",
          "name": "Linguistics",
          "orig": "en:Linguistics",
          "parents": [
            "Language",
            "Social sciences",
            "Communication",
            "Sciences",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A language posited against actual evidence, a merely fancied natural language."
      ],
      "id": "en-ghost_language-en-noun-vD622EWy",
      "links": [
        [
          "posit",
          "posit"
        ],
        [
          "actual",
          "actual"
        ],
        [
          "evidence",
          "evidence"
        ],
        [
          "merely",
          "merely"
        ],
        [
          "fancied",
          "fancy"
        ],
        [
          "natural language",
          "natural language"
        ]
      ],
      "synonyms": [
        {
          "word": "spurious language"
        }
      ]
    }
  ],
  "word": "ghost language"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "en:Linguistics"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "ghost town"
      },
      "expansion": "ghost town",
      "name": "m"
    }
  ],
  "etymology_text": "By analogy to ghost town.",
  "forms": [
    {
      "form": "ghost languages",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "ghost language (plural ghost languages)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2000, Juliette Blevins, Nhanda: An Aboriginal Language of Western Australia (Oceanic linguistics special publication; 30), Honolulu: University of Hawai'i Press, page ix",
          "text": "Of the 250 or so Aboriginal languages once spoken in Australia, two-thirds are extinct or moribund. Coastal languages were usually the first to go, with settlement patterns matching patterns of extinction. In Western Australia, the former of approximately 110 Aboriginal languages, 45 were presumed extinct, and another 30 were on the verge of extinction. Wajuk, the original language of Perth, was dead. Nyungar, the language of the southwestern tip of the continent, was gone. Mirning, the language of Eucla, had disappeared with barely a trace. Witjaari, once spoken north of Wajuk, was now a ghost language. And the list went on. I had come to a land of linguistic devastation.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A language which has lost its speakers."
      ],
      "links": [
        [
          "lost",
          "lose"
        ],
        [
          "speakers",
          "speakers"
        ]
      ],
      "synonyms": [
        {
          "word": "dead language"
        },
        {
          "word": "extinct language"
        }
      ]
    },
    {
      "glosses": [
        "A language posited against actual evidence, a merely fancied natural language."
      ],
      "links": [
        [
          "posit",
          "posit"
        ],
        [
          "actual",
          "actual"
        ],
        [
          "evidence",
          "evidence"
        ],
        [
          "merely",
          "merely"
        ],
        [
          "fancied",
          "fancy"
        ],
        [
          "natural language",
          "natural language"
        ]
      ],
      "synonyms": [
        {
          "word": "spurious language"
        }
      ]
    }
  ],
  "word": "ghost language"
}