"réaction en chaîne" meaning in French

{
  "forms": [
    {
      "form": "réactions en chaîne",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "réaction en chaîne f (plural réactions en chaîne)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "related": [
    {
      "_dis1": "0 0",
      "word": "effet papillon"
    }
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "fr",
          "name": "Physics",
          "orig": "fr:Physics",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "56 44",
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "60 40",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "64 36",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "chain reaction (nuclear reaction in which particles produced by the fission of one atom trigger fissions of other atoms)"
      ],
      "id": "en-réaction_en_chaîne-fr-noun-Aw2miexh",
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "chain reaction",
          "chain reaction"
        ]
      ],
      "raw_glosses": [
        "(physics) chain reaction (nuclear reaction in which particles produced by the fission of one atom trigger fissions of other atoms)"
      ],
      "tags": [
        "feminine"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    },
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "fr",
          "name": "Chemistry",
          "orig": "fr:Chemistry",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "chain reaction (series of events, each one causing or influencing the next)"
      ],
      "hyponyms": [
        {
          "word": "réaction en chaîne par polymérase"
        }
      ],
      "id": "en-réaction_en_chaîne-fr-noun-XtZYWzLG",
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "chain reaction",
          "chain reaction"
        ]
      ],
      "raw_glosses": [
        "(chemistry)",
        "(figuratively) chain reaction (series of events, each one causing or influencing the next)"
      ],
      "tags": [
        "feminine",
        "figuratively"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ʁe.ak.sjɔ̃ ɑ̃ ʃɛn/"
    }
  ],
  "word": "réaction en chaîne"
}

{
  "categories": [
    "French countable nouns",
    "French entries with incorrect language header",
    "French feminine nouns",
    "French lemmas",
    "French multiword terms",
    "French nouns",
    "French terms with IPA pronunciation",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "forms": [
    {
      "form": "réactions en chaîne",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "réaction en chaîne f (plural réactions en chaîne)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "related": [
    {
      "word": "effet papillon"
    }
  ],
  "senses": [
    {
      "categories": [
        "fr:Physics"
      ],
      "glosses": [
        "chain reaction (nuclear reaction in which particles produced by the fission of one atom trigger fissions of other atoms)"
      ],
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "chain reaction",
          "chain reaction"
        ]
      ],
      "raw_glosses": [
        "(physics) chain reaction (nuclear reaction in which particles produced by the fission of one atom trigger fissions of other atoms)"
      ],
      "tags": [
        "feminine"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    },
    {
      "categories": [
        "fr:Chemistry"
      ],
      "glosses": [
        "chain reaction (series of events, each one causing or influencing the next)"
      ],
      "hyponyms": [
        {
          "word": "réaction en chaîne par polymérase"
        }
      ],
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "chain reaction",
          "chain reaction"
        ]
      ],
      "raw_glosses": [
        "(chemistry)",
        "(figuratively) chain reaction (series of events, each one causing or influencing the next)"
      ],
      "tags": [
        "feminine",
        "figuratively"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ʁe.ak.sjɔ̃ ɑ̃ ʃɛn/"
    }
  ],
  "word": "réaction en chaîne"
}