"réaction" meaning in French

{
  "derived": [
    {
      "_dis1": "0 0",
      "word": "à réaction"
    },
    {
      "_dis1": "0 0",
      "word": "avion à réaction"
    },
    {
      "_dis1": "0 0",
      "word": "réaction de Maréchal"
    },
    {
      "_dis1": "0 0",
      "word": "réaction en chaîne"
    }
  ],
  "forms": [
    {
      "form": "réactions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "réaction f (plural réactions)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "related": [
    {
      "_dis1": "0 0",
      "word": "réagir"
    }
  ],
  "senses": [
    {
      "glosses": [
        "reaction (action in response to an event)"
      ],
      "id": "en-réaction-fr-noun-YIyF~BVn",
      "links": [
        [
          "reaction",
          "reaction"
        ]
      ],
      "tags": [
        "feminine"
      ]
    },
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "fr",
          "name": "Sciences",
          "orig": "fr:Sciences",
          "parents": [
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "14 86",
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "12 88",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "7 93",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "reaction"
      ],
      "id": "en-réaction-fr-noun-URY5pKmi",
      "links": [
        [
          "sciences",
          "sciences"
        ],
        [
          "reaction",
          "reaction"
        ]
      ],
      "raw_glosses": [
        "(sciences) reaction"
      ],
      "tags": [
        "feminine"
      ],
      "topics": [
        "sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ʁe.ak.sjɔ̃/"
    },
    {
      "audio": "Fr-réaction.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/4/4a/Fr-r%C3%A9action.ogg/Fr-r%C3%A9action.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/4/4a/Fr-r%C3%A9action.ogg"
    }
  ],
  "wikipedia": [
    "fr:réaction"
  ],
  "word": "réaction"
}

{
  "categories": [
    "French 3-syllable words",
    "French countable nouns",
    "French entries with incorrect language header",
    "French feminine nouns",
    "French lemmas",
    "French nouns",
    "French terms with IPA pronunciation",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "derived": [
    {
      "word": "à réaction"
    },
    {
      "word": "avion à réaction"
    },
    {
      "word": "réaction de Maréchal"
    },
    {
      "word": "réaction en chaîne"
    }
  ],
  "forms": [
    {
      "form": "réactions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "réaction f (plural réactions)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "related": [
    {
      "word": "réagir"
    }
  ],
  "senses": [
    {
      "glosses": [
        "reaction (action in response to an event)"
      ],
      "links": [
        [
          "reaction",
          "reaction"
        ]
      ],
      "tags": [
        "feminine"
      ]
    },
    {
      "categories": [
        "fr:Sciences"
      ],
      "glosses": [
        "reaction"
      ],
      "links": [
        [
          "sciences",
          "sciences"
        ],
        [
          "reaction",
          "reaction"
        ]
      ],
      "raw_glosses": [
        "(sciences) reaction"
      ],
      "tags": [
        "feminine"
      ],
      "topics": [
        "sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ʁe.ak.sjɔ̃/"
    },
    {
      "audio": "Fr-réaction.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/4/4a/Fr-r%C3%A9action.ogg/Fr-r%C3%A9action.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/4/4a/Fr-r%C3%A9action.ogg"
    }
  ],
  "wikipedia": [
    "fr:réaction"
  ],
  "word": "réaction"
}