"doppel-" meaning in German

{
  "etymology_text": "From doppel in compounds; compare doppelt.",
  "head_templates": [
    {
      "args": {
        "1": "de",
        "2": "prefix"
      },
      "expansion": "doppel-",
      "name": "head"
    }
  ],
  "lang": "German",
  "lang_code": "de",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "German entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "doppel- + Bett (“bed”) → Doppelbett (“double bed”)",
          "type": "example"
        },
        {
          "text": "doppel- + Beschluss (“decision”) → Doppelbeschluss (“double-track decision”)",
          "type": "example"
        },
        {
          "text": "doppel- + Spitze (“leadership”) → Doppelspitze (“dual leadership”)",
          "type": "example"
        }
      ],
      "glosses": [
        "Indicates a doubling of the following noun; double-."
      ],
      "id": "en-doppel--de-prefix-f15TZVAn",
      "links": [
        [
          "double-",
          "double"
        ]
      ],
      "related": [
        {
          "word": "Doppel"
        }
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈdɔpl̩/"
    }
  ],
  "word": "doppel-"
}

{
  "etymology_text": "From doppel in compounds; compare doppelt.",
  "head_templates": [
    {
      "args": {
        "1": "de",
        "2": "prefix"
      },
      "expansion": "doppel-",
      "name": "head"
    }
  ],
  "lang": "German",
  "lang_code": "de",
  "pos": "prefix",
  "related": [
    {
      "word": "Doppel"
    }
  ],
  "senses": [
    {
      "categories": [
        "German entries with incorrect language header",
        "German lemmas",
        "German prefixes",
        "Pages with 2 entries",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "doppel- + Bett (“bed”) → Doppelbett (“double bed”)",
          "type": "example"
        },
        {
          "text": "doppel- + Beschluss (“decision”) → Doppelbeschluss (“double-track decision”)",
          "type": "example"
        },
        {
          "text": "doppel- + Spitze (“leadership”) → Doppelspitze (“dual leadership”)",
          "type": "example"
        }
      ],
      "glosses": [
        "Indicates a doubling of the following noun; double-."
      ],
      "links": [
        [
          "double-",
          "double"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈdɔpl̩/"
    }
  ],
  "word": "doppel-"
}