"head note" meaning in English

{
  "forms": [
    {
      "form": "head notes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "head note (plural head notes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "Synonym of top note (“most volatile parts of a perfume”)"
      ],
      "id": "en-head_note-en-noun-Si7L2jgk",
      "links": [
        [
          "top note",
          "top note#English"
        ]
      ],
      "synonyms": [
        {
          "extra": "most volatile parts of a perfume",
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "top note"
        }
      ]
    },
    {
      "alt_of": [
        {
          "extra": "a summary or remark at the beginning",
          "word": "headnote"
        }
      ],
      "categories": [
        {
          "_dis": "43 57",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Alternative spelling of headnote (“a summary or remark at the beginning”)"
      ],
      "id": "en-head_note-en-noun-BbO7SRWl",
      "links": [
        [
          "headnote",
          "headnote#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "head note"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns"
  ],
  "forms": [
    {
      "form": "head notes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "head note (plural head notes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "Synonym of top note (“most volatile parts of a perfume”)"
      ],
      "links": [
        [
          "top note",
          "top note#English"
        ]
      ],
      "synonyms": [
        {
          "extra": "most volatile parts of a perfume",
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "top note"
        }
      ]
    },
    {
      "alt_of": [
        {
          "extra": "a summary or remark at the beginning",
          "word": "headnote"
        }
      ],
      "glosses": [
        "Alternative spelling of headnote (“a summary or remark at the beginning”)"
      ],
      "links": [
        [
          "headnote",
          "headnote#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "head note"
}