"disubstitution" meaning in English

{
  "etymology_templates": [
    {
      "args": {
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        "2": "di",
        "3": "substitution"
      },
      "expansion": "di- + substitution",
      "name": "prefix"
    }
  ],
  "etymology_text": "From di- + substitution.",
  "forms": [
    {
      "form": "disubstitutions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
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      "expansion": "disubstitution (countable and uncountable, plural disubstitutions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
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        {
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          "parents": [],
          "source": "w"
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          "langcode": "en",
          "name": "Organic chemistry",
          "orig": "en:Organic chemistry",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Any substitution reaction in which two groups are substituted"
      ],
      "id": "en-disubstitution-en-noun-BASVSl-~",
      "links": [
        [
          "organic chemistry",
          "organic chemistry"
        ],
        [
          "substitution",
          "substitution"
        ],
        [
          "reaction",
          "reaction"
        ]
      ],
      "raw_glosses": [
        "(organic chemistry) Any substitution reaction in which two groups are substituted"
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "organic-chemistry",
        "physical-sciences"
      ]
    }
  ],
  "word": "disubstitution"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "di",
        "3": "substitution"
      },
      "expansion": "di- + substitution",
      "name": "prefix"
    }
  ],
  "etymology_text": "From di- + substitution.",
  "forms": [
    {
      "form": "disubstitutions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
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      "expansion": "disubstitution (countable and uncountable, plural disubstitutions)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "en:Organic chemistry"
      ],
      "glosses": [
        "Any substitution reaction in which two groups are substituted"
      ],
      "links": [
        [
          "organic chemistry",
          "organic chemistry"
        ],
        [
          "substitution",
          "substitution"
        ],
        [
          "reaction",
          "reaction"
        ]
      ],
      "raw_glosses": [
        "(organic chemistry) Any substitution reaction in which two groups are substituted"
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "organic-chemistry",
        "physical-sciences"
      ]
    }
  ],
  "word": "disubstitution"
}