"a due" meaning in Italian

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "nb",
            "2": "a due",
            "bor": "1"
          },
          "expansion": "→ Norwegian Bokmål: a due",
          "name": "desc"
        }
      ],
      "text": "→ Norwegian Bokmål: a due"
    }
  ],
  "head_templates": [
    {
      "args": {
        "inv": "1"
      },
      "expansion": "a due (invariable)",
      "name": "it-adj"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Italian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "it",
          "name": "Music",
          "orig": "it:Music",
          "parents": [
            "Art",
            "Sound",
            "Culture",
            "Energy",
            "Society",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "\"for two\", indicating both musicians or sections play together"
      ],
      "id": "en-a_due-it-adj-6J5dBCVa",
      "links": [
        [
          "music",
          "music"
        ]
      ],
      "raw_glosses": [
        "(music) \"for two\", indicating both musicians or sections play together"
      ],
      "tags": [
        "invariable"
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/a‿dˈdu.e/"
    }
  ],
  "word": "a due"
}

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "nb",
            "2": "a due",
            "bor": "1"
          },
          "expansion": "→ Norwegian Bokmål: a due",
          "name": "desc"
        }
      ],
      "text": "→ Norwegian Bokmål: a due"
    }
  ],
  "head_templates": [
    {
      "args": {
        "inv": "1"
      },
      "expansion": "a due (invariable)",
      "name": "it-adj"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "Italian adjectives",
        "Italian entries with incorrect language header",
        "Italian indeclinable adjectives",
        "Italian lemmas",
        "Italian multiword terms",
        "Italian terms with IPA pronunciation",
        "it:Music"
      ],
      "glosses": [
        "\"for two\", indicating both musicians or sections play together"
      ],
      "links": [
        [
          "music",
          "music"
        ]
      ],
      "raw_glosses": [
        "(music) \"for two\", indicating both musicians or sections play together"
      ],
      "tags": [
        "invariable"
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/a‿dˈdu.e/"
    }
  ],
  "word": "a due"
}