"ultimísimo" meaning in Spanish

{
  "forms": [
    {
      "form": "ultimísima",
      "tags": [
        "feminine"
      ]
    },
    {
      "form": "ultimísimos",
      "tags": [
        "masculine",
        "plural"
      ]
    },
    {
      "form": "ultimísimas",
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "hyphenation": [
    "ul‧ti‧mí‧si‧mo"
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "último"
        }
      ],
      "glosses": [
        "superlative degree of último"
      ],
      "id": "en-ultimísimo-es-adj-S~Ud5oOM",
      "links": [
        [
          "último",
          "último#Spanish"
        ]
      ],
      "tags": [
        "form-of",
        "superlative"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ultiˈmisimo/"
    },
    {
      "ipa": "[ul̪.t̪iˈmi.si.mo]"
    },
    {
      "rhymes": "-isimo"
    }
  ],
  "word": "ultimísimo"
}

{
  "forms": [
    {
      "form": "ultimísima",
      "tags": [
        "feminine"
      ]
    },
    {
      "form": "ultimísimos",
      "tags": [
        "masculine",
        "plural"
      ]
    },
    {
      "form": "ultimísimas",
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "hyphenation": [
    "ul‧ti‧mí‧si‧mo"
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Rhymes:Spanish/isimo",
        "Rhymes:Spanish/isimo/5 syllables",
        "Spanish 5-syllable words",
        "Spanish adjectives",
        "Spanish entries with incorrect language header",
        "Spanish lemmas",
        "Spanish superlative adjectives",
        "Spanish terms with IPA pronunciation"
      ],
      "form_of": [
        {
          "word": "último"
        }
      ],
      "glosses": [
        "superlative degree of último"
      ],
      "links": [
        [
          "último",
          "último#Spanish"
        ]
      ],
      "tags": [
        "form-of",
        "superlative"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ultiˈmisimo/"
    },
    {
      "ipa": "[ul̪.t̪iˈmi.si.mo]"
    },
    {
      "rhymes": "-isimo"
    }
  ],
  "word": "ultimísimo"
}