"polarity item" meaning in All languages combined

{
  "forms": [
    {
      "form": "polarity items",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "polarity item (plural polarity items)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Linguistics",
          "orig": "en:Linguistics",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A lexical item that can appear only in environments associated with a particular grammatical polarity."
      ],
      "id": "en-polarity_item-en-noun--SCbREQL",
      "links": [
        [
          "linguistics",
          "linguistics"
        ],
        [
          "lexical",
          "lexical"
        ],
        [
          "environment",
          "environment"
        ],
        [
          "polarity",
          "polarity"
        ]
      ],
      "raw_glosses": [
        "(linguistics) A lexical item that can appear only in environments associated with a particular grammatical polarity."
      ],
      "topics": [
        "human-sciences",
        "linguistics",
        "sciences"
      ],
      "wikipedia": [
        "polarity item"
      ]
    }
  ],
  "word": "polarity item"
}

{
  "forms": [
    {
      "form": "polarity items",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "polarity item (plural polarity items)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Linguistics"
      ],
      "glosses": [
        "A lexical item that can appear only in environments associated with a particular grammatical polarity."
      ],
      "links": [
        [
          "linguistics",
          "linguistics"
        ],
        [
          "lexical",
          "lexical"
        ],
        [
          "environment",
          "environment"
        ],
        [
          "polarity",
          "polarity"
        ]
      ],
      "raw_glosses": [
        "(linguistics) A lexical item that can appear only in environments associated with a particular grammatical polarity."
      ],
      "topics": [
        "human-sciences",
        "linguistics",
        "sciences"
      ],
      "wikipedia": [
        "polarity item"
      ]
    }
  ],
  "word": "polarity item"
}