"hors-série" meaning in French

{
  "forms": [
    {
      "form": "hors-séries",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "hors-série m (plural hors-séries)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fr",
          "name": "Publishing",
          "orig": "fr:Publishing",
          "parents": [
            "Industries",
            "Mass media",
            "Business",
            "Culture",
            "Media",
            "Economics",
            "Society",
            "Communication",
            "Social sciences",
            "All topics",
            "Sciences",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "extra (special issue)"
      ],
      "id": "en-hors-série-fr-noun-ONafhjxx",
      "links": [
        [
          "publishing",
          "publishing#Noun"
        ],
        [
          "extra",
          "extra"
        ]
      ],
      "raw_glosses": [
        "(publishing) extra (special issue)"
      ],
      "tags": [
        "masculine"
      ],
      "topics": [
        "media",
        "publishing"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ɔʁ.se.ʁi/"
    }
  ],
  "word": "hors-série"
}

{
  "forms": [
    {
      "form": "hors-séries",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "hors-série m (plural hors-séries)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "French 3-syllable words",
        "French countable nouns",
        "French entries with incorrect language header",
        "French lemmas",
        "French masculine nouns",
        "French multiword terms",
        "French nouns",
        "French nouns with red links in their headword lines",
        "French terms with IPA pronunciation",
        "fr:Publishing"
      ],
      "glosses": [
        "extra (special issue)"
      ],
      "links": [
        [
          "publishing",
          "publishing#Noun"
        ],
        [
          "extra",
          "extra"
        ]
      ],
      "raw_glosses": [
        "(publishing) extra (special issue)"
      ],
      "tags": [
        "masculine"
      ],
      "topics": [
        "media",
        "publishing"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ɔʁ.se.ʁi/"
    }
  ],
  "word": "hors-série"
}