"alcalde mayor" meaning in Spanish

{
  "forms": [
    {
      "form": "alcaldes mayores",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "alcalde mayor m (plural alcaldes mayores)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Peninsular Spanish",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "a regional magistrate"
      ],
      "id": "en-alcalde_mayor-es-noun-FkZWXCRA",
      "links": [
        [
          "magistrate",
          "magistrate"
        ]
      ],
      "raw_glosses": [
        "(Spain, historical) a regional magistrate"
      ],
      "tags": [
        "Spain",
        "historical",
        "masculine"
      ]
    }
  ],
  "word": "alcalde mayor"
}

{
  "forms": [
    {
      "form": "alcaldes mayores",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "alcalde mayor m (plural alcaldes mayores)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Peninsular Spanish",
        "Spanish countable nouns",
        "Spanish entries with incorrect language header",
        "Spanish lemmas",
        "Spanish masculine nouns",
        "Spanish multiword terms",
        "Spanish nouns",
        "Spanish nouns with red links in their headword lines",
        "Spanish terms with historical senses"
      ],
      "glosses": [
        "a regional magistrate"
      ],
      "links": [
        [
          "magistrate",
          "magistrate"
        ]
      ],
      "raw_glosses": [
        "(Spain, historical) a regional magistrate"
      ],
      "tags": [
        "Spain",
        "historical",
        "masculine"
      ]
    }
  ],
  "word": "alcalde mayor"
}