"trisubstitution" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "tri",
        "3": "substitution"
      },
      "expansion": "tri- + substitution",
      "name": "prefix"
    }
  ],
  "etymology_text": "From tri- + substitution.",
  "forms": [
    {
      "form": "trisubstitutions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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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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          "name": "English terms prefixed with tri-",
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          "orig": "en:Organic chemistry",
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            "Fundamental"
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          "source": "w"
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      ],
      "glosses": [
        "Any substitution reaction in which three groups are substituted."
      ],
      "id": "en-trisubstitution-en-noun-pxJNzavL",
      "links": [
        [
          "organic chemistry",
          "organic chemistry"
        ],
        [
          "substitution",
          "substitution"
        ],
        [
          "reaction",
          "reaction"
        ]
      ],
      "raw_glosses": [
        "(organic chemistry) Any substitution reaction in which three groups are substituted."
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "organic-chemistry",
        "physical-sciences"
      ]
    }
  ],
  "word": "trisubstitution"
}

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