"二重否定" meaning in Japanese

{
  "forms": [
    {
      "form": "二重否定",
      "ruby": [
        [
          "二",
          "に"
        ],
        [
          "重",
          "じゅう"
        ],
        [
          "否",
          "ひ"
        ],
        [
          "定",
          "てい"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "nijūhitei",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "にじゅうひてい"
      },
      "expansion": "二(に)重(じゅう)否(ひ)定(てい) • (nijūhitei)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "double negative"
      ],
      "id": "en-二重否定-ja-noun-G7glLuxI",
      "links": [
        [
          "double negative",
          "double negative"
        ]
      ],
      "related": [
        {
          "roman": "daburunega",
          "word": "ダブルネガ"
        },
        {
          "roman": "daburunegatibu",
          "word": "ダブルネガティブ"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ɲ̟iʑɨᵝːçite̞ː]"
    }
  ],
  "word": "二重否定"
}

{
  "forms": [
    {
      "form": "二重否定",
      "ruby": [
        [
          "二",
          "に"
        ],
        [
          "重",
          "じゅう"
        ],
        [
          "否",
          "ひ"
        ],
        [
          "定",
          "てい"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "nijūhitei",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "にじゅうひてい"
      },
      "expansion": "二(に)重(じゅう)否(ひ)定(てい) • (nijūhitei)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "related": [
    {
      "roman": "daburunega",
      "word": "ダブルネガ"
    },
    {
      "roman": "daburunegatibu",
      "word": "ダブルネガティブ"
    }
  ],
  "senses": [
    {
      "categories": [
        "Japanese entries with incorrect language header",
        "Japanese lemmas",
        "Japanese links with redundant wikilinks",
        "Japanese nouns",
        "Japanese terms spelled with first grade kanji",
        "Japanese terms spelled with sixth grade kanji",
        "Japanese terms spelled with third grade kanji",
        "Japanese terms with IPA pronunciation",
        "Japanese terms with redundant sortkeys",
        "Japanese terms written with four Han script characters"
      ],
      "glosses": [
        "double negative"
      ],
      "links": [
        [
          "double negative",
          "double negative"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ɲ̟iʑɨᵝːçite̞ː]"
    }
  ],
  "word": "二重否定"
}

{
  "called_from": "parser/1336",
  "msg": "no corresponding start tag found for </span>",
  "path": [
    "二重否定"
  ],
  "section": "Japanese",
  "subsection": "noun",
  "title": "二重否定",
  "trace": ""
}