"mountainbiker" meaning in English

{
  "forms": [
    {
      "form": "mountainbikers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "mountainbiker (plural mountainbikers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "mountain biker"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2019 September 12, “Aims Games: Rotorua's Poppy Croucher secures top five placing at inaugural mountainbike event, plus results”, in Bay of Plenty Times",
          "text": "Coming from a family of keen mountainbikers, there really was no doubt Rotorua's Poppy Croucher was going to be part of the first mountainbiking event at Aims Games.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of mountain biker."
      ],
      "id": "en-mountainbiker-en-noun-U2ytaPzc",
      "links": [
        [
          "mountain biker",
          "mountain biker#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "mountainbiker"
}

{
  "forms": [
    {
      "form": "mountainbikers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "mountainbiker (plural mountainbikers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "mountain biker"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2019 September 12, “Aims Games: Rotorua's Poppy Croucher secures top five placing at inaugural mountainbike event, plus results”, in Bay of Plenty Times",
          "text": "Coming from a family of keen mountainbikers, there really was no doubt Rotorua's Poppy Croucher was going to be part of the first mountainbiking event at Aims Games.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of mountain biker."
      ],
      "links": [
        [
          "mountain biker",
          "mountain biker#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "mountainbiker"
}