"series original" meaning in English

{
  "forms": [
    {
      "form": "series originals",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "series original (plural series originals)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Narratology",
          "orig": "en:Narratology",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "The first published narrative in a series of works; a narrative from which later narratives are written after. It serves as the chronological core of the series."
      ],
      "id": "en-series_original-en-noun-NJRV4xts",
      "links": [
        [
          "narratology",
          "narratology"
        ]
      ],
      "raw_glosses": [
        "(narratology) The first published narrative in a series of works; a narrative from which later narratives are written after. It serves as the chronological core of the series."
      ],
      "related": [
        {
          "word": "intermission"
        },
        {
          "word": "interquel"
        },
        {
          "word": "prequel"
        },
        {
          "word": "reboot"
        },
        {
          "word": "sequel"
        }
      ],
      "topics": [
        "human-sciences",
        "linguistics",
        "narratology",
        "sciences"
      ]
    }
  ],
  "word": "series original"
}

{
  "forms": [
    {
      "form": "series originals",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "series original (plural series originals)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "intermission"
    },
    {
      "word": "interquel"
    },
    {
      "word": "prequel"
    },
    {
      "word": "reboot"
    },
    {
      "word": "sequel"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Narratology"
      ],
      "glosses": [
        "The first published narrative in a series of works; a narrative from which later narratives are written after. It serves as the chronological core of the series."
      ],
      "links": [
        [
          "narratology",
          "narratology"
        ]
      ],
      "raw_glosses": [
        "(narratology) The first published narrative in a series of works; a narrative from which later narratives are written after. It serves as the chronological core of the series."
      ],
      "topics": [
        "human-sciences",
        "linguistics",
        "narratology",
        "sciences"
      ]
    }
  ],
  "word": "series original"
}