"concrete class" meaning in English

{
  "antonyms": [
    {
      "word": "abstract class"
    }
  ],
  "forms": [
    {
      "form": "concrete classes",
      "tags": [
        "plural"
      ]
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  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "concrete class (plural concrete classes)",
      "name": "en-noun"
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  "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"
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        },
        {
          "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"
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          "source": "w"
        }
      ],
      "glosses": [
        "A class that can be instantiated and may have concrete methods."
      ],
      "id": "en-concrete_class-en-noun-KnSOZ9QK",
      "links": [
        [
          "object-oriented programming",
          "object-oriented programming"
        ],
        [
          "class",
          "class"
        ],
        [
          "concrete method",
          "concrete method"
        ]
      ],
      "qualifier": "object-oriented programming",
      "raw_glosses": [
        "(object-oriented programming) A class that can be instantiated and may have concrete methods."
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "in software - a class that can be instantiated",
          "word": "konkreettinen luokka"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "in software - a class that can be instantiated",
          "word": "toteutuva luokka"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "in software - a class that can be instantiated",
          "tags": [
            "feminine"
          ],
          "word": "classe concrète"
        },
        {
          "code": "pl",
          "lang": "Polish",
          "sense": "in software - a class that can be instantiated",
          "tags": [
            "feminine"
          ],
          "word": "klasa konkretna"
        }
      ],
      "wikipedia": [
        "concrete class"
      ]
    }
  ],
  "word": "concrete class"
}

{
  "antonyms": [
    {
      "word": "abstract class"
    }
  ],
  "forms": [
    {
      "form": "concrete classes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "concrete class (plural concrete classes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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    {
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        "English countable nouns",
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        "English multiword terms",
        "English nouns",
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        "Pages with entries",
        "Terms with Finnish translations",
        "Terms with French translations",
        "Terms with Polish translations",
        "en:Object-oriented programming"
      ],
      "glosses": [
        "A class that can be instantiated and may have concrete methods."
      ],
      "links": [
        [
          "object-oriented programming",
          "object-oriented programming"
        ],
        [
          "class",
          "class"
        ],
        [
          "concrete method",
          "concrete method"
        ]
      ],
      "qualifier": "object-oriented programming",
      "raw_glosses": [
        "(object-oriented programming) A class that can be instantiated and may have concrete methods."
      ],
      "wikipedia": [
        "concrete class"
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "in software - a class that can be instantiated",
      "word": "konkreettinen luokka"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "in software - a class that can be instantiated",
      "word": "toteutuva luokka"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "in software - a class that can be instantiated",
      "tags": [
        "feminine"
      ],
      "word": "classe concrète"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "in software - a class that can be instantiated",
      "tags": [
        "feminine"
      ],
      "word": "klasa konkretna"
    }
  ],
  "word": "concrete class"
}