"numero uno" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "es",
        "3": "número uno"
      },
      "expansion": "Spanish número uno",
      "name": "bor"
    },
    {
      "args": {
        "1": "en",
        "2": "it",
        "3": "numero uno"
      },
      "expansion": "Italian numero uno",
      "name": "bor"
    },
    {
      "args": {
        "1": "en",
        "2": "number one"
      },
      "expansion": "Piecewise doublet of number one",
      "name": "piecewise doublet"
    }
  ],
  "etymology_text": "From either Spanish número uno or Italian numero uno. Piecewise doublet of number one.",
  "forms": [
    {
      "form": "numero unos",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "nolinkhead": "1"
      },
      "expansion": "numero uno (plural numero unos)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [],
      "glosses": [
        "The most important of a group."
      ],
      "id": "en-numero_uno-en-noun-RjOJtIwI",
      "links": [
        [
          "important",
          "important"
        ]
      ],
      "raw_glosses": [
        "(informal) The most important of a group."
      ],
      "synonyms": [
        {
          "word": "important person"
        }
      ],
      "tags": [
        "informal"
      ]
    },
    {
      "categories": [
        {
          "_dis": "7 93",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "5 95",
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "4 96",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "5 95",
          "kind": "topical",
          "langcode": "en",
          "name": "One",
          "orig": "en:One",
          "parents": [
            "Numbers",
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "In his business ventures, he always looks after numero uno.",
          "type": "example"
        }
      ],
      "glosses": [
        "Oneself, especially one’s own interests."
      ],
      "id": "en-numero_uno-en-noun-SkrX0rbc",
      "links": [
        [
          "Oneself",
          "oneself"
        ],
        [
          "interest",
          "interest"
        ]
      ],
      "raw_glosses": [
        "(informal) Oneself, especially one’s own interests."
      ],
      "related": [
        {
          "_dis1": "34 66",
          "word": "look out for number one"
        }
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "word": "numero uno"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "English piecewise doublets",
    "English terms borrowed from Italian",
    "English terms borrowed from Spanish",
    "English terms derived from Italian",
    "English terms derived from Spanish",
    "Pages with 2 entries",
    "Pages with entries",
    "en:One"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "es",
        "3": "número uno"
      },
      "expansion": "Spanish número uno",
      "name": "bor"
    },
    {
      "args": {
        "1": "en",
        "2": "it",
        "3": "numero uno"
      },
      "expansion": "Italian numero uno",
      "name": "bor"
    },
    {
      "args": {
        "1": "en",
        "2": "number one"
      },
      "expansion": "Piecewise doublet of number one",
      "name": "piecewise doublet"
    }
  ],
  "etymology_text": "From either Spanish número uno or Italian numero uno. Piecewise doublet of number one.",
  "forms": [
    {
      "form": "numero unos",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "nolinkhead": "1"
      },
      "expansion": "numero uno (plural numero unos)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "look out for number one"
    }
  ],
  "senses": [
    {
      "categories": [
        "English informal terms"
      ],
      "glosses": [
        "The most important of a group."
      ],
      "links": [
        [
          "important",
          "important"
        ]
      ],
      "raw_glosses": [
        "(informal) The most important of a group."
      ],
      "synonyms": [
        {
          "word": "important person"
        }
      ],
      "tags": [
        "informal"
      ]
    },
    {
      "categories": [
        "English informal terms",
        "English terms with usage examples"
      ],
      "examples": [
        {
          "text": "In his business ventures, he always looks after numero uno.",
          "type": "example"
        }
      ],
      "glosses": [
        "Oneself, especially one’s own interests."
      ],
      "links": [
        [
          "Oneself",
          "oneself"
        ],
        [
          "interest",
          "interest"
        ]
      ],
      "raw_glosses": [
        "(informal) Oneself, especially one’s own interests."
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "word": "numero uno"
}