"negativer" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "negative",
        "3": "er"
      },
      "expansion": "negative + -er",
      "name": "suffix"
    }
  ],
  "etymology_text": "negative + -er",
  "forms": [
    {
      "form": "negativers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "negativer (plural negativers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms suffixed with -er",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1867, The British Controversialist, and Literary Magazine, page 276",
          "text": "R.S. dexterously endeavours to shift “the burden of proof” upon the writers on this side, on the general condition that the burden of proof lies with the negativers of any accepted doctrine.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "One who negatives."
      ],
      "id": "en-negativer-en-noun-LZpxRbl7",
      "links": [
        [
          "negative",
          "negative"
        ]
      ]
    }
  ],
  "word": "negativer"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "negative",
        "3": "er"
      },
      "expansion": "negative + -er",
      "name": "suffix"
    }
  ],
  "etymology_text": "negative + -er",
  "forms": [
    {
      "form": "negativers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "negativer (plural negativers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms suffixed with -er",
        "English terms with quotations",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "1867, The British Controversialist, and Literary Magazine, page 276",
          "text": "R.S. dexterously endeavours to shift “the burden of proof” upon the writers on this side, on the general condition that the burden of proof lies with the negativers of any accepted doctrine.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "One who negatives."
      ],
      "links": [
        [
          "negative",
          "negative"
        ]
      ]
    }
  ],
  "word": "negativer"
}