"addition polymerization" meaning in English

{
  "forms": [
    {
      "form": "addition polymerizations",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "addition polymerization (plural addition polymerizations)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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          "source": "w"
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          "kind": "topical",
          "langcode": "en",
          "name": "Chemical reactions",
          "orig": "en:Chemical reactions",
          "parents": [
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          "source": "w"
        }
      ],
      "glosses": [
        "A form of polymerization in which copies of a monomer are repeatedly added to one end of an existing polymer"
      ],
      "id": "en-addition_polymerization-en-noun-mwbRs8rY",
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "monomer",
          "monomer"
        ],
        [
          "polymer",
          "polymer"
        ]
      ],
      "raw_glosses": [
        "(chemistry) A form of polymerization in which copies of a monomer are repeatedly added to one end of an existing polymer"
      ],
      "synonyms": [
        {
          "word": "chain growth polymerization"
        }
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "addition polymerization"
}

{
  "forms": [
    {
      "form": "addition polymerizations",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "addition polymerization (plural addition polymerizations)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Chemical reactions",
        "en:Polymer"
      ],
      "glosses": [
        "A form of polymerization in which copies of a monomer are repeatedly added to one end of an existing polymer"
      ],
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "monomer",
          "monomer"
        ],
        [
          "polymer",
          "polymer"
        ]
      ],
      "raw_glosses": [
        "(chemistry) A form of polymerization in which copies of a monomer are repeatedly added to one end of an existing polymer"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "chain growth polymerization"
    }
  ],
  "word": "addition polymerization"
}