"double plural" meaning in English

{
  "forms": [
    {
      "form": "double plurals",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "double plural (plural double plurals)",
      "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": "Urdu terms with non-redundant manual transliterations",
          "parents": [
            "Terms with non-redundant manual transliterations",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Grammar",
          "orig": "en:Grammar",
          "parents": [
            "Linguistics",
            "Language",
            "Social sciences",
            "Communication",
            "Sciences",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A word doubly inflected for the plural grammatical number in relation to its singular form; e.g., medium → media → medias."
      ],
      "id": "en-double_plural-en-noun-52~OxEOF",
      "links": [
        [
          "grammar",
          "grammar"
        ],
        [
          "doubly",
          "doubly"
        ],
        [
          "inflect",
          "inflect"
        ],
        [
          "plural",
          "plural"
        ],
        [
          "number",
          "number"
        ],
        [
          "singular",
          "singular"
        ],
        [
          "medium",
          "medium#English"
        ],
        [
          "media",
          "media#English"
        ],
        [
          "medias",
          "medias#English"
        ]
      ],
      "raw_glosses": [
        "(grammar) A word doubly inflected for the plural grammatical number in relation to its singular form; e.g., medium → media → medias."
      ],
      "topics": [
        "grammar",
        "human-sciences",
        "linguistics",
        "sciences"
      ],
      "translations": [
        {
          "code": "ar",
          "lang": "Arabic",
          "roman": "jamʕ al-jamʕ",
          "sense": "doubly inflected plural",
          "tags": [
            "masculine"
          ],
          "word": "جَمْع الْجَمْع"
        },
        {
          "code": "br",
          "lang": "Breton",
          "sense": "doubly inflected plural",
          "tags": [
            "masculine"
          ],
          "word": "adliester"
        },
        {
          "code": "nl",
          "lang": "Dutch",
          "sense": "doubly inflected plural",
          "tags": [
            "neuter"
          ],
          "word": "stapelmeervoud"
        },
        {
          "code": "fa",
          "lang": "Persian",
          "roman": "jam'o-ljam'",
          "sense": "doubly inflected plural",
          "word": "جمعالجمع"
        },
        {
          "code": "ur",
          "lang": "Urdu",
          "note": "جَمْعُ الْجَمْع sg or f (jam‘u’l-jam‘, literally “plural of plural”) (Linguistics)",
          "sense": "doubly inflected plural"
        }
      ],
      "wikipedia": [
        "double plural"
      ]
    }
  ],
  "word": "double plural"
}

{
  "forms": [
    {
      "form": "double plurals",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "double plural (plural double plurals)",
      "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",
        "Urdu terms with non-redundant manual transliterations",
        "en:Grammar"
      ],
      "glosses": [
        "A word doubly inflected for the plural grammatical number in relation to its singular form; e.g., medium → media → medias."
      ],
      "links": [
        [
          "grammar",
          "grammar"
        ],
        [
          "doubly",
          "doubly"
        ],
        [
          "inflect",
          "inflect"
        ],
        [
          "plural",
          "plural"
        ],
        [
          "number",
          "number"
        ],
        [
          "singular",
          "singular"
        ],
        [
          "medium",
          "medium#English"
        ],
        [
          "media",
          "media#English"
        ],
        [
          "medias",
          "medias#English"
        ]
      ],
      "raw_glosses": [
        "(grammar) A word doubly inflected for the plural grammatical number in relation to its singular form; e.g., medium → media → medias."
      ],
      "topics": [
        "grammar",
        "human-sciences",
        "linguistics",
        "sciences"
      ],
      "wikipedia": [
        "double plural"
      ]
    }
  ],
  "translations": [
    {
      "code": "ar",
      "lang": "Arabic",
      "roman": "jamʕ al-jamʕ",
      "sense": "doubly inflected plural",
      "tags": [
        "masculine"
      ],
      "word": "جَمْع الْجَمْع"
    },
    {
      "code": "br",
      "lang": "Breton",
      "sense": "doubly inflected plural",
      "tags": [
        "masculine"
      ],
      "word": "adliester"
    },
    {
      "code": "nl",
      "lang": "Dutch",
      "sense": "doubly inflected plural",
      "tags": [
        "neuter"
      ],
      "word": "stapelmeervoud"
    },
    {
      "code": "fa",
      "lang": "Persian",
      "roman": "jam'o-ljam'",
      "sense": "doubly inflected plural",
      "word": "جمعالجمع"
    },
    {
      "code": "ur",
      "lang": "Urdu",
      "note": "جَمْعُ الْجَمْع sg or f (jam‘u’l-jam‘, literally “plural of plural”) (Linguistics)",
      "sense": "doubly inflected plural"
    }
  ],
  "word": "double plural"
}