"master data" meaning in English

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      "expansion": "master data (uncountable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Data management",
          "orig": "en:Data management",
          "parents": [
            "Computer science",
            "Information science",
            "Computing",
            "Sciences",
            "Applied sciences",
            "Technology",
            "All topics",
            "Fundamental"
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      ],
      "derived": [
        {
          "word": "master data management"
        }
      ],
      "glosses": [
        "Reference data."
      ],
      "id": "en-master_data-en-noun-CeYN0KwB",
      "links": [
        [
          "data management",
          "data management"
        ],
        [
          "Reference data",
          "reference data"
        ]
      ],
      "qualifier": "data management",
      "raw_glosses": [
        "(data management) Reference data."
      ],
      "tags": [
        "uncountable"
      ],
      "translations": [
        {
          "code": "de",
          "lang": "German",
          "sense": "information",
          "tags": [
            "neuter",
            "plural"
          ],
          "word": "Stammdaten"
        },
        {
          "code": "it",
          "lang": "Italian",
          "sense": "information",
          "tags": [
            "masculine",
            "plural"
          ],
          "word": "dati anagrafici"
        }
      ],
      "wikipedia": [
        "master data"
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  "word": "master data"
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      "word": "master data management"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "en:Data management"
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      "glosses": [
        "Reference data."
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      ],
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        "(data management) Reference data."
      ],
      "tags": [
        "uncountable"
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        "master data"
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  "translations": [
    {
      "code": "de",
      "lang": "German",
      "sense": "information",
      "tags": [
        "neuter",
        "plural"
      ],
      "word": "Stammdaten"
    },
    {
      "code": "it",
      "lang": "Italian",
      "sense": "information",
      "tags": [
        "masculine",
        "plural"
      ],
      "word": "dati anagrafici"
    }
  ],
  "word": "master data"
}