"doubly-linked" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "doubly-linked (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "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 language name categories using raw markup",
          "parents": [
            "Entries with language name 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": "topical",
          "langcode": "en",
          "name": "Programming",
          "orig": "en:Programming",
          "parents": [
            "Computing",
            "Software engineering",
            "Technology",
            "Computer science",
            "Engineering",
            "Software",
            "All topics",
            "Sciences",
            "Applied sciences",
            "Media",
            "Fundamental",
            "Communication"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "a doubly-linked list",
          "type": "example"
        }
      ],
      "glosses": [
        "Whose elements each link to the previous and the next element."
      ],
      "id": "en-doubly-linked-en-adj-TYlHaVUw",
      "links": [
        [
          "programming",
          "programming#Noun"
        ],
        [
          "data structure",
          "data structure"
        ],
        [
          "element",
          "element"
        ],
        [
          "previous",
          "previous"
        ],
        [
          "next",
          "next"
        ]
      ],
      "raw_glosses": [
        "(programming, of a data structure) Whose elements each link to the previous and the next element."
      ],
      "raw_tags": [
        "of a data structure"
      ],
      "related": [
        {
          "word": "linked list"
        }
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "computing",
        "engineering",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "programming",
        "sciences"
      ]
    }
  ],
  "word": "doubly-linked"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "doubly-linked (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "related": [
    {
      "word": "linked list"
    }
  ],
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English adverb-adjective phrases",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English terms with non-redundant non-automated sortkeys",
        "English terms with usage examples",
        "English uncomparable adjectives",
        "en:Programming"
      ],
      "examples": [
        {
          "text": "a doubly-linked list",
          "type": "example"
        }
      ],
      "glosses": [
        "Whose elements each link to the previous and the next element."
      ],
      "links": [
        [
          "programming",
          "programming#Noun"
        ],
        [
          "data structure",
          "data structure"
        ],
        [
          "element",
          "element"
        ],
        [
          "previous",
          "previous"
        ],
        [
          "next",
          "next"
        ]
      ],
      "raw_glosses": [
        "(programming, of a data structure) Whose elements each link to the previous and the next element."
      ],
      "raw_tags": [
        "of a data structure"
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "computing",
        "engineering",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "programming",
        "sciences"
      ]
    }
  ],
  "word": "doubly-linked"
}