"double replacement reaction" meaning in English

{
  "forms": [
    {
      "form": "double replacement reactions",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "double-replacement reaction",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "double replacement reaction (plural double replacement reactions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
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          "source": "w"
        }
      ],
      "glosses": [
        "A chemical reaction involving a change of chemical bonds, so that two compounds become two different compounds, in the form AB+CD→AD+CB"
      ],
      "id": "en-double_replacement_reaction-en-noun-vaJFYP~N",
      "links": [
        [
          "chemical reaction",
          "chemical reaction"
        ],
        [
          "chemical bond",
          "chemical bond"
        ]
      ]
    }
  ],
  "word": "double replacement reaction"
}

{
  "forms": [
    {
      "form": "double replacement reactions",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "double-replacement reaction",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "double replacement reaction (plural double replacement reactions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "A chemical reaction involving a change of chemical bonds, so that two compounds become two different compounds, in the form AB+CD→AD+CB"
      ],
      "links": [
        [
          "chemical reaction",
          "chemical reaction"
        ],
        [
          "chemical bond",
          "chemical bond"
        ]
      ]
    }
  ],
  "word": "double replacement reaction"
}