"連鎖反応" meaning in Japanese

{
  "forms": [
    {
      "form": "連鎖反応",
      "ruby": [
        [
          "連",
          "れん"
        ],
        [
          "鎖",
          "さ"
        ],
        [
          "反",
          "はん"
        ],
        [
          "応",
          "のう"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "rensa hannō",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "れんさ はんのう"
      },
      "expansion": "連(れん)鎖(さ)反(はん)応(のう) • (rensa hannō)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "52 48",
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "52 48",
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "59 41",
          "kind": "other",
          "name": "Japanese terms with 4 kanji",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "54 46",
          "kind": "other",
          "name": "Japanese terms with multiple readings",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "52 48",
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "54 46",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "53 47",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "chain reaction (series of events)"
      ],
      "id": "en-連鎖反応-ja-noun-KGTQ9J~7",
      "links": [
        [
          "chain reaction",
          "chain reaction"
        ]
      ]
    },
    {
      "categories": [
        {
          "_dis": "52 48",
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "52 48",
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "54 46",
          "kind": "other",
          "name": "Japanese terms with multiple readings",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "52 48",
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "54 46",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "53 47",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "chain reaction (type of nuclear reaction)"
      ],
      "id": "en-連鎖反応-ja-noun-OQ66AnTk"
    }
  ],
  "sounds": [
    {
      "ipa": "[ɾẽ̞ɰ̃sa̠ hã̠nːo̞ː]"
    }
  ],
  "word": "連鎖反応"
}

{
  "categories": [
    "Japanese entries with incorrect language header",
    "Japanese lemmas",
    "Japanese links with redundant wikilinks",
    "Japanese nouns",
    "Japanese terms spelled with fifth grade kanji",
    "Japanese terms spelled with fourth grade kanji",
    "Japanese terms spelled with secondary school kanji",
    "Japanese terms spelled with third grade kanji",
    "Japanese terms with 4 kanji",
    "Japanese terms with IPA pronunciation",
    "Japanese terms with IPA pronunciation missing pitch accent",
    "Japanese terms with multiple readings",
    "Japanese terms with redundant sortkeys",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "forms": [
    {
      "form": "連鎖反応",
      "ruby": [
        [
          "連",
          "れん"
        ],
        [
          "鎖",
          "さ"
        ],
        [
          "反",
          "はん"
        ],
        [
          "応",
          "のう"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "rensa hannō",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "れんさ はんのう"
      },
      "expansion": "連(れん)鎖(さ)反(はん)応(のう) • (rensa hannō)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "chain reaction (series of events)"
      ],
      "links": [
        [
          "chain reaction",
          "chain reaction"
        ]
      ]
    },
    {
      "glosses": [
        "chain reaction (type of nuclear reaction)"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ɾẽ̞ɰ̃sa̠ hã̠nːo̞ː]"
    }
  ],
  "word": "連鎖反応"
}

{
  "called_from": "parser/1336",
  "msg": "no corresponding start tag found for </span>",
  "path": [
    "連鎖反応"
  ],
  "section": "Japanese",
  "subsection": "noun",
  "title": "連鎖反応",
  "trace": ""
}