"hadn't" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "had",
        "3": "n't"
      },
      "expansion": "had + -n't",
      "name": "suffix"
    }
  ],
  "etymology_text": "had + -n't",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "verb form"
      },
      "expansion": "hadn't",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "negative auxiliary",
          "word": "had not"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms suffixed with -n't",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Contraction of had not. (negative auxiliary)"
      ],
      "id": "en-hadn't-en-verb-Stx9SBl8",
      "links": [
        [
          "had",
          "had#English"
        ],
        [
          "not",
          "not#English"
        ]
      ],
      "raw_glosses": [
        "(informal) Contraction of had not. (negative auxiliary)"
      ],
      "synonyms": [
        {
          "word": "hadna"
        },
        {
          "tags": [
            "dialectal",
            "nonstandard"
          ],
          "word": "hadnae"
        },
        {
          "word": "hant"
        },
        {
          "english": "pronunciation spellings",
          "word": "hedn't"
        }
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "contraction",
        "informal"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈhæd(ə)nt/"
    },
    {
      "audio": "en-us-hadn't.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/f/fc/En-us-hadn%27t.ogg/En-us-hadn%27t.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/f/fc/En-us-hadn%27t.ogg",
      "tags": [
        "US"
      ],
      "text": "Audio (US)"
    }
  ],
  "word": "hadn't"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "had",
        "3": "n't"
      },
      "expansion": "had + -n't",
      "name": "suffix"
    }
  ],
  "etymology_text": "had + -n't",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "verb form"
      },
      "expansion": "hadn't",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "negative auxiliary",
          "word": "had not"
        }
      ],
      "categories": [
        "English 2-syllable words",
        "English auxiliary verb forms",
        "English contractions",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English informal terms",
        "English non-lemma forms",
        "English terms suffixed with -n't",
        "English terms with IPA pronunciation",
        "English terms with audio links",
        "English terms with non-redundant non-automated sortkeys",
        "English verb forms"
      ],
      "glosses": [
        "Contraction of had not. (negative auxiliary)"
      ],
      "links": [
        [
          "had",
          "had#English"
        ],
        [
          "not",
          "not#English"
        ]
      ],
      "raw_glosses": [
        "(informal) Contraction of had not. (negative auxiliary)"
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "contraction",
        "informal"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈhæd(ə)nt/"
    },
    {
      "audio": "en-us-hadn't.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/f/fc/En-us-hadn%27t.ogg/En-us-hadn%27t.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/f/fc/En-us-hadn%27t.ogg",
      "tags": [
        "US"
      ],
      "text": "Audio (US)"
    }
  ],
  "synonyms": [
    {
      "word": "hadna"
    },
    {
      "tags": [
        "dialectal",
        "nonstandard"
      ],
      "word": "hadnae"
    },
    {
      "word": "hant"
    },
    {
      "english": "pronunciation spellings",
      "word": "hedn't"
    }
  ],
  "word": "hadn't"
}