"subcollection" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sub",
        "3": "collection"
      },
      "expansion": "sub- + collection",
      "name": "prefix"
    }
  ],
  "etymology_text": "sub- + collection",
  "forms": [
    {
      "form": "subcollections",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "subcollection (plural subcollections)",
      "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": "other",
          "name": "English terms prefixed with sub-",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2018, Matthew Z. Wood, Comic Book Collections and Programming: A Practical Guide for Librarians",
          "text": "Humor books are easy to catalog as a part of a comics collection—treat them as a subcollection of comics (aka fiction) and group them first by creator, then by series title, paying attention to volume numbers and/or dates of publication.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A subset of a collection."
      ],
      "id": "en-subcollection-en-noun-C6HYqn8P",
      "links": [
        [
          "subset",
          "subset"
        ],
        [
          "collection",
          "collection"
        ]
      ]
    }
  ],
  "word": "subcollection"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sub",
        "3": "collection"
      },
      "expansion": "sub- + collection",
      "name": "prefix"
    }
  ],
  "etymology_text": "sub- + collection",
  "forms": [
    {
      "form": "subcollections",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "subcollection (plural subcollections)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms prefixed with sub-",
        "English terms with quotations",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "2018, Matthew Z. Wood, Comic Book Collections and Programming: A Practical Guide for Librarians",
          "text": "Humor books are easy to catalog as a part of a comics collection—treat them as a subcollection of comics (aka fiction) and group them first by creator, then by series title, paying attention to volume numbers and/or dates of publication.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A subset of a collection."
      ],
      "links": [
        [
          "subset",
          "subset"
        ],
        [
          "collection",
          "collection"
        ]
      ]
    }
  ],
  "word": "subcollection"
}