"existential instantiation" meaning in English

{
  "forms": [
    {
      "form": "existential instantiations",
      "tags": [
        "plural"
      ]
    }
  ],
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    {
      "args": {},
      "expansion": "existential instantiation (plural existential instantiations)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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          "orig": "en:Logic",
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      ],
      "glosses": [
        "In predicate logic, an inference rule of the form ∃x P(x) ⊢ P(c), where c is a new symbol (not part of the original domain of discourse, but which can stand for an element of it (as in Skolemization))."
      ],
      "hypernyms": [
        {
          "word": "inference rule"
        }
      ],
      "id": "en-existential_instantiation-en-noun-Zzot4sml",
      "links": [
        [
          "logic",
          "logic"
        ],
        [
          "predicate logic",
          "predicate logic"
        ],
        [
          "inference rule",
          "inference rule"
        ],
        [
          "domain of discourse",
          "domain of discourse"
        ]
      ],
      "raw_glosses": [
        "(logic) In predicate logic, an inference rule of the form ∃x P(x) ⊢ P(c), where c is a new symbol (not part of the original domain of discourse, but which can stand for an element of it (as in Skolemization))."
      ],
      "topics": [
        "human-sciences",
        "logic",
        "mathematics",
        "philosophy",
        "sciences"
      ]
    }
  ],
  "word": "existential instantiation"
}

{
  "forms": [
    {
      "form": "existential instantiations",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
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      "expansion": "existential instantiation (plural existential instantiations)",
      "name": "en-noun"
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  ],
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    {
      "word": "inference rule"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "English multiword terms",
        "English nouns",
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        "en:Logic"
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      "glosses": [
        "In predicate logic, an inference rule of the form ∃x P(x) ⊢ P(c), where c is a new symbol (not part of the original domain of discourse, but which can stand for an element of it (as in Skolemization))."
      ],
      "links": [
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          "logic",
          "logic"
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          "predicate logic",
          "predicate logic"
        ],
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          "inference rule",
          "inference rule"
        ],
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          "domain of discourse",
          "domain of discourse"
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      "raw_glosses": [
        "(logic) In predicate logic, an inference rule of the form ∃x P(x) ⊢ P(c), where c is a new symbol (not part of the original domain of discourse, but which can stand for an element of it (as in Skolemization))."
      ],
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        "human-sciences",
        "logic",
        "mathematics",
        "philosophy",
        "sciences"
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  "word": "existential instantiation"
}