"rearrangement reaction" meaning in English

{
  "forms": [
    {
      "form": "rearrangement reactions",
      "tags": [
        "plural"
      ]
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  ],
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      "expansion": "rearrangement reaction (plural rearrangement reactions)",
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  "lang_code": "en",
  "pos": "noun",
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          "orig": "en:Chemistry",
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      ],
      "glosses": [
        "any of many classes of reaction in which an atom or bond moves or migrates from a site in a reactant molecule to a different site in a product molecule"
      ],
      "id": "en-rearrangement_reaction-en-noun-s46FJPJ4",
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          "chemistry",
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          "atom",
          "atom"
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          "bond",
          "bond"
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        [
          "reactant",
          "reactant"
        ],
        [
          "molecule",
          "molecule"
        ],
        [
          "product",
          "product"
        ]
      ],
      "raw_glosses": [
        "(chemistry) any of many classes of reaction in which an atom or bond moves or migrates from a site in a reactant molecule to a different site in a product molecule"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ],
      "wikipedia": [
        "rearrangement reaction"
      ]
    }
  ],
  "word": "rearrangement reaction"
}

{
  "forms": [
    {
      "form": "rearrangement reactions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "rearrangement reaction (plural rearrangement reactions)",
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  "lang_code": "en",
  "pos": "noun",
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      ],
      "glosses": [
        "any of many classes of reaction in which an atom or bond moves or migrates from a site in a reactant molecule to a different site in a product molecule"
      ],
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        [
          "chemistry",
          "chemistry"
        ],
        [
          "atom",
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        ],
        [
          "bond",
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        [
          "reactant",
          "reactant"
        ],
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      "raw_glosses": [
        "(chemistry) any of many classes of reaction in which an atom or bond moves or migrates from a site in a reactant molecule to a different site in a product molecule"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ],
      "wikipedia": [
        "rearrangement reaction"
      ]
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  ],
  "word": "rearrangement reaction"
}