"HD DVD" meaning in English

{
  "forms": [
    {
      "form": "HD DVDs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "HD DVD (plural HD DVDs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "High-Definition/Density DVD"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Initialism of High-Definition/Density DVD."
      ],
      "id": "en-HD_DVD-en-noun-HoRlMRWW",
      "links": [
        [
          "High-Definition/Density DVD",
          "w:HD DVD"
        ]
      ],
      "related": [
        {
          "word": "HD"
        },
        {
          "word": "DVD"
        }
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
      ]
    }
  ],
  "word": "HD DVD"
}

{
  "forms": [
    {
      "form": "HD DVDs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "HD DVD (plural HD DVDs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "HD"
    },
    {
      "word": "DVD"
    }
  ],
  "senses": [
    {
      "alt_of": [
        {
          "word": "High-Definition/Density DVD"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English initialisms",
        "English lemmas",
        "English links with redundant wikilinks",
        "English multiword terms",
        "English nouns",
        "English words without vowels",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Initialism of High-Definition/Density DVD."
      ],
      "links": [
        [
          "High-Definition/Density DVD",
          "w:HD DVD"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
      ]
    }
  ],
  "word": "HD DVD"
}