"polyaddition" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "poly",
        "3": "addition"
      },
      "expansion": "poly- + addition",
      "name": "prefix"
    }
  ],
  "etymology_text": "From poly- + addition.",
  "forms": [
    {
      "form": "polyadditions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "polyaddition (plural polyadditions)",
      "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": [
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          "source": "w"
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          "name": "English terms prefixed with poly-",
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          "source": "w"
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          "orig": "en:Chemistry",
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            "All topics",
            "Fundamental"
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          "source": "w"
        }
      ],
      "glosses": [
        "Any addition reaction that yields a polymer."
      ],
      "id": "en-polyaddition-en-noun-HtFD6pVu",
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "addition reaction",
          "addition reaction"
        ],
        [
          "polymer",
          "polymer"
        ]
      ],
      "raw_glosses": [
        "(chemistry) Any addition reaction that yields a polymer."
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "polyaddition"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "poly",
        "3": "addition"
      },
      "expansion": "poly- + addition",
      "name": "prefix"
    }
  ],
  "etymology_text": "From poly- + addition.",
  "forms": [
    {
      "form": "polyadditions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "polyaddition (plural polyadditions)",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "English nouns",
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      "glosses": [
        "Any addition reaction that yields a polymer."
      ],
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "addition reaction",
          "addition reaction"
        ],
        [
          "polymer",
          "polymer"
        ]
      ],
      "raw_glosses": [
        "(chemistry) Any addition reaction that yields a polymer."
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "polyaddition"
}