"adoptive sibling" meaning in English

{
  "forms": [
    {
      "form": "adoptive siblings",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "adoptive sibling (plural adoptive siblings)",
      "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": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Finnish translations",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A person who is not one's biological sibling, but was legally and socially raised as if they were."
      ],
      "id": "en-adoptive_sibling-en-noun-dSB4XYpK",
      "related": [
        {
          "word": "adoptive parent"
        }
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "adoptive sibling",
          "word": "adoptiosisarus"
        }
      ]
    }
  ],
  "word": "adoptive sibling"
}

{
  "forms": [
    {
      "form": "adoptive siblings",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "adoptive sibling (plural adoptive siblings)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "adoptive parent"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Terms with Finnish translations"
      ],
      "glosses": [
        "A person who is not one's biological sibling, but was legally and socially raised as if they were."
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "adoptive sibling",
      "word": "adoptiosisarus"
    }
  ],
  "word": "adoptive sibling"
}