"冒頭" meaning in 日本語

{
  "categories": [
    {
      "kind": "other",
      "name": "日本語",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "日本語 国際音声記号あり",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "日本語_名詞",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "ぼうとう"
    }
  ],
  "lang": "日本語",
  "lang_code": "ja",
  "pos": "noun",
  "pos_title": "名詞",
  "related": [
    {
      "word": "ヘッダー"
    }
  ],
  "senses": [
    {
      "glosses": [
        "その文や話の始まりの出出し。"
      ],
      "id": "ja-冒頭-ja-noun-ZPB1T4fy"
    },
    {
      "glosses": [
        "物事の始め。のっけ。単独で副詞的、他の語句と合わせて副詞句的にも用いられる。"
      ],
      "id": "ja-冒頭-ja-noun-BVQqmFrd"
    }
  ],
  "sounds": [
    {
      "form": "ぼーとー",
      "raw_tags": [
        "東京式"
      ],
      "roman": "[bòótóó]",
      "tags": [
        "Heiban"
      ]
    },
    {
      "ipa": "[bo̞ːto̞ː]"
    }
  ],
  "word": "冒頭"
}

{
  "categories": [
    "日本語",
    "日本語 国際音声記号あり",
    "日本語_名詞"
  ],
  "forms": [
    {
      "form": "ぼうとう"
    }
  ],
  "lang": "日本語",
  "lang_code": "ja",
  "pos": "noun",
  "pos_title": "名詞",
  "related": [
    {
      "word": "ヘッダー"
    }
  ],
  "senses": [
    {
      "glosses": [
        "その文や話の始まりの出出し。"
      ]
    },
    {
      "glosses": [
        "物事の始め。のっけ。単独で副詞的、他の語句と合わせて副詞句的にも用いられる。"
      ]
    }
  ],
  "sounds": [
    {
      "form": "ぼーとー",
      "raw_tags": [
        "東京式"
      ],
      "roman": "[bòótóó]",
      "tags": [
        "Heiban"
      ]
    },
    {
      "ipa": "[bo̞ːto̞ː]"
    }
  ],
  "word": "冒頭"
}