"fission nucléaire" meaning in French

{
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      "args": {
        "1": "f",
        "2": "-"
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      "expansion": "fission nucléaire f (uncountable)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fr",
          "name": "Nuclear warfare",
          "orig": "fr:Nuclear warfare",
          "parents": [
            "War",
            "Weapons",
            "Conflict",
            "Military",
            "Violence",
            "Hunting",
            "Tools",
            "Human behaviour",
            "Society",
            "Human activity",
            "Technology",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "nuclear fission"
      ],
      "id": "en-fission_nucléaire-fr-noun-QFcwaWCm",
      "links": [
        [
          "nuclear fission",
          "nuclear fission"
        ]
      ],
      "tags": [
        "feminine",
        "uncountable"
      ],
      "wikipedia": [
        "fr:fission nucléaire"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/fi.sjɔ̃ ny.kle.ɛʁ/"
    }
  ],
  "word": "fission nucléaire"
}

{
  "head_templates": [
    {
      "args": {
        "1": "f",
        "2": "-"
      },
      "expansion": "fission nucléaire f (uncountable)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "French entries with incorrect language header",
        "French feminine nouns",
        "French lemmas",
        "French multiword terms",
        "French nouns",
        "French terms with IPA pronunciation",
        "French uncountable nouns",
        "fr:Nuclear warfare"
      ],
      "glosses": [
        "nuclear fission"
      ],
      "links": [
        [
          "nuclear fission",
          "nuclear fission"
        ]
      ],
      "tags": [
        "feminine",
        "uncountable"
      ],
      "wikipedia": [
        "fr:fission nucléaire"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/fi.sjɔ̃ ny.kle.ɛʁ/"
    }
  ],
  "word": "fission nucléaire"
}