"virtual function" meaning in English

{
  "forms": [
    {
      "form": "virtual functions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "virtual function (plural virtual functions)",
      "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": "topical",
          "langcode": "en",
          "name": "Object-oriented programming",
          "orig": "en:Object-oriented programming",
          "parents": [
            "Programming",
            "Computing",
            "Software engineering",
            "Technology",
            "Computer science",
            "Engineering",
            "Software",
            "All topics",
            "Sciences",
            "Applied sciences",
            "Media",
            "Fundamental",
            "Communication"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Synonym of virtual method"
      ],
      "id": "en-virtual_function-en-noun-X5zrDrH8",
      "links": [
        [
          "object-oriented programming",
          "object-oriented programming"
        ],
        [
          "virtual method",
          "virtual method#English"
        ]
      ],
      "qualifier": "object-oriented programming",
      "raw_glosses": [
        "(object-oriented programming) Synonym of virtual method"
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "virtual method"
        }
      ]
    }
  ],
  "word": "virtual function"
}

{
  "forms": [
    {
      "form": "virtual functions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "virtual function (plural virtual functions)",
      "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",
        "en:Object-oriented programming"
      ],
      "glosses": [
        "Synonym of virtual method"
      ],
      "links": [
        [
          "object-oriented programming",
          "object-oriented programming"
        ],
        [
          "virtual method",
          "virtual method#English"
        ]
      ],
      "qualifier": "object-oriented programming",
      "raw_glosses": [
        "(object-oriented programming) Synonym of virtual method"
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "virtual method"
        }
      ]
    }
  ],
  "word": "virtual function"
}