"half birthday" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "half",
        "3": "birthday"
      },
      "expansion": "half + birthday",
      "name": "compound"
    }
  ],
  "etymology_text": "half + birthday",
  "forms": [
    {
      "form": "half birthdays",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "half birthday (plural half birthdays)",
      "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"
        }
      ],
      "examples": [
        {
          "ref": "2003, Meg Cox, The Book of New Family Traditions, page 263",
          "text": "You can sing \"Happy Half Birthday to You!\" or you could try only singing every other word."
        },
        {
          "ref": "2004, Ginnie Mesibov, Outer Strength, Inner Strength, page 39",
          "text": "The fete was Mary Beth's half-birthday."
        },
        {
          "ref": "2009, Philip Done, Close Encounters of the Third-Grade Kind: Thoughts on Teacherhood",
          "text": "“Your halfbirthday?” I pointed to the plate."
        },
        {
          "ref": "2009, Bill Glazer, Dan Kennedy, Outrageous Advertising That's Outrageously Successful, page 257",
          "text": "After all, a half-birthday celebration for an adult is OUTRAGEOUS in itself.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "The day halfway in between two consecutive birthdays."
      ],
      "id": "en-half_birthday-en-noun-zXhOS38z",
      "links": [
        [
          "halfway",
          "halfway"
        ],
        [
          "consecutive",
          "consecutive"
        ],
        [
          "birthday",
          "birthday"
        ]
      ],
      "synonyms": [
        {
          "word": "half-birthday"
        }
      ],
      "wikipedia": [
        "half birthday"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-us-ncalif-halfbirthday.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/3/34/En-us-ncalif-halfbirthday.ogg/En-us-ncalif-halfbirthday.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/3/34/En-us-ncalif-halfbirthday.ogg",
      "tags": [
        "Northern-California",
        "US"
      ],
      "text": "Audio (US, Northern California)"
    }
  ],
  "word": "half birthday"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "half",
        "3": "birthday"
      },
      "expansion": "half + birthday",
      "name": "compound"
    }
  ],
  "etymology_text": "half + birthday",
  "forms": [
    {
      "form": "half birthdays",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "half birthday (plural half birthdays)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English compound terms",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with audio links",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2003, Meg Cox, The Book of New Family Traditions, page 263",
          "text": "You can sing \"Happy Half Birthday to You!\" or you could try only singing every other word."
        },
        {
          "ref": "2004, Ginnie Mesibov, Outer Strength, Inner Strength, page 39",
          "text": "The fete was Mary Beth's half-birthday."
        },
        {
          "ref": "2009, Philip Done, Close Encounters of the Third-Grade Kind: Thoughts on Teacherhood",
          "text": "“Your halfbirthday?” I pointed to the plate."
        },
        {
          "ref": "2009, Bill Glazer, Dan Kennedy, Outrageous Advertising That's Outrageously Successful, page 257",
          "text": "After all, a half-birthday celebration for an adult is OUTRAGEOUS in itself.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "The day halfway in between two consecutive birthdays."
      ],
      "links": [
        [
          "halfway",
          "halfway"
        ],
        [
          "consecutive",
          "consecutive"
        ],
        [
          "birthday",
          "birthday"
        ]
      ],
      "wikipedia": [
        "half birthday"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-us-ncalif-halfbirthday.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/3/34/En-us-ncalif-halfbirthday.ogg/En-us-ncalif-halfbirthday.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/3/34/En-us-ncalif-halfbirthday.ogg",
      "tags": [
        "Northern-California",
        "US"
      ],
      "text": "Audio (US, Northern California)"
    }
  ],
  "synonyms": [
    {
      "word": "half-birthday"
    }
  ],
  "word": "half birthday"
}