"plural relations" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "plural relations (uncountable)",
      "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 entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "South African English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Racism",
          "orig": "en:Racism",
          "parents": [
            "Forms of discrimination",
            "Discrimination",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "apartheid"
      ],
      "id": "en-plural_relations-en-noun-0ReirJq4",
      "links": [
        [
          "apartheid",
          "apartheid"
        ]
      ],
      "raw_glosses": [
        "(South Africa, historical) apartheid"
      ],
      "tags": [
        "South-Africa",
        "historical",
        "uncountable"
      ]
    }
  ],
  "word": "plural relations"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "plural relations (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with historical senses",
        "English terms with non-redundant non-automated sortkeys",
        "English uncountable nouns",
        "South African English",
        "en:Racism"
      ],
      "glosses": [
        "apartheid"
      ],
      "links": [
        [
          "apartheid",
          "apartheid"
        ]
      ],
      "raw_glosses": [
        "(South Africa, historical) apartheid"
      ],
      "tags": [
        "South-Africa",
        "historical",
        "uncountable"
      ]
    }
  ],
  "word": "plural relations"
}