"contraportada" meaning in Spanish

{
  "forms": [
    {
      "form": "contraportadas",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "contraportada f (plural contraportadas)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "es",
          "name": "Mass media",
          "orig": "es:Mass media",
          "parents": [
            "Culture",
            "Media",
            "Society",
            "Communication",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "back page"
      ],
      "id": "en-contraportada-es-noun-JYHKQlXM",
      "links": [
        [
          "journalism",
          "journalism"
        ],
        [
          "back page",
          "back page"
        ]
      ],
      "raw_glosses": [
        "(journalism) back page"
      ],
      "related": [
        {
          "word": "portada"
        }
      ],
      "tags": [
        "feminine"
      ],
      "topics": [
        "journalism",
        "media"
      ]
    }
  ],
  "word": "contraportada"
}

{
  "forms": [
    {
      "form": "contraportadas",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "contraportada f (plural contraportadas)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "related": [
    {
      "word": "portada"
    }
  ],
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Spanish countable nouns",
        "Spanish entries with incorrect language header",
        "Spanish feminine nouns",
        "Spanish lemmas",
        "Spanish nouns",
        "es:Mass media"
      ],
      "glosses": [
        "back page"
      ],
      "links": [
        [
          "journalism",
          "journalism"
        ],
        [
          "back page",
          "back page"
        ]
      ],
      "raw_glosses": [
        "(journalism) back page"
      ],
      "tags": [
        "feminine"
      ],
      "topics": [
        "journalism",
        "media"
      ]
    }
  ],
  "word": "contraportada"
}