"u" meaning in Catalan

{
  "etymology_number": 1,
  "forms": [
    {
      "form": "us",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "u f (plural us)",
      "name": "ca-noun"
    }
  ],
  "lang": "Catalan",
  "lang_code": "ca",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "71 29",
          "kind": "other",
          "name": "Catalan entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "kind": "other",
          "name": "Catalan feminine nouns with no feminine ending",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "96 4",
          "kind": "other",
          "name": "Catalan links with redundant alt parameters",
          "parents": [
            "Links with redundant alt parameters",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "52 48",
          "kind": "topical",
          "name": "Catalan cardinal numbers",
          "parents": [
            "Cardinal numbers",
            "Numbers",
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "97 3",
          "kind": "topical",
          "langcode": "ca",
          "name": "Latin letter names",
          "orig": "ca:Latin letter names",
          "parents": [
            "Letter names",
            "Letters, symbols, and punctuation",
            "Names",
            "Orthography",
            "All topics",
            "Proper nouns",
            "Terms by semantic function",
            "Writing",
            "Fundamental",
            "Nouns",
            "Human behaviour",
            "Language",
            "Lemmas",
            "Human",
            "Communication"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "the Latin letter U (lowercase u)"
      ],
      "id": "en-u-ca-noun-FuO6GeY4",
      "links": [
        [
          "U",
          "U"
        ],
        [
          "u",
          "u#English"
        ]
      ],
      "tags": [
        "feminine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈu]",
      "tags": [
        "Balearic",
        "Central",
        "Valencian"
      ]
    },
    {
      "rhymes": "-u"
    }
  ],
  "word": "u"
}

{
  "etymology_number": 2,
  "etymology_templates": [
    {
      "args": {
        "1": "ca",
        "2": "1"
      },
      "expansion": "",
      "name": "number box"
    }
  ],
  "forms": [
    {
      "form": "uns",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m",
        "2": "#ns"
      },
      "expansion": "u m (plural uns)",
      "name": "ca-noun"
    }
  ],
  "lang": "Catalan",
  "lang_code": "ca",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "52 48",
          "kind": "topical",
          "name": "Catalan cardinal numbers",
          "parents": [
            "Cardinal numbers",
            "Numbers",
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w+disamb"
        }
      ],
      "derived": [
        {
          "word": "cada u"
        }
      ],
      "glosses": [
        "one"
      ],
      "id": "en-u-ca-noun-dpLDrTVA",
      "links": [
        [
          "one",
          "one"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈu]",
      "tags": [
        "Balearic",
        "Central",
        "Valencian"
      ]
    },
    {
      "rhymes": "-u"
    }
  ],
  "word": "u"
}

{
  "categories": [
    "Catalan cardinal numbers",
    "Catalan countable nouns",
    "Catalan entries with incorrect language header",
    "Catalan feminine nouns",
    "Catalan feminine nouns with no feminine ending",
    "Catalan lemmas",
    "Catalan links with redundant alt parameters",
    "Catalan masculine nouns",
    "Catalan nouns",
    "Catalan terms with IPA pronunciation",
    "Pages with raw sortkeys",
    "Rhymes:Catalan/u",
    "Rhymes:Catalan/u/1 syllable",
    "ca:Latin letter names"
  ],
  "etymology_number": 1,
  "forms": [
    {
      "form": "us",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "u f (plural us)",
      "name": "ca-noun"
    }
  ],
  "lang": "Catalan",
  "lang_code": "ca",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "the Latin letter U (lowercase u)"
      ],
      "links": [
        [
          "U",
          "U"
        ],
        [
          "u",
          "u#English"
        ]
      ],
      "tags": [
        "feminine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈu]",
      "tags": [
        "Balearic",
        "Central",
        "Valencian"
      ]
    },
    {
      "rhymes": "-u"
    }
  ],
  "word": "u"
}

{
  "categories": [
    "Catalan cardinal numbers",
    "Catalan countable nouns",
    "Catalan entries with incorrect language header",
    "Catalan lemmas",
    "Catalan links with redundant alt parameters",
    "Catalan masculine nouns",
    "Catalan nouns",
    "Catalan terms with IPA pronunciation",
    "Pages with raw sortkeys",
    "Rhymes:Catalan/u",
    "Rhymes:Catalan/u/1 syllable",
    "ca:Latin letter names"
  ],
  "derived": [
    {
      "word": "cada u"
    }
  ],
  "etymology_number": 2,
  "etymology_templates": [
    {
      "args": {
        "1": "ca",
        "2": "1"
      },
      "expansion": "",
      "name": "number box"
    }
  ],
  "forms": [
    {
      "form": "uns",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m",
        "2": "#ns"
      },
      "expansion": "u m (plural uns)",
      "name": "ca-noun"
    }
  ],
  "lang": "Catalan",
  "lang_code": "ca",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "one"
      ],
      "links": [
        [
          "one",
          "one"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈu]",
      "tags": [
        "Balearic",
        "Central",
        "Valencian"
      ]
    },
    {
      "rhymes": "-u"
    }
  ],
  "word": "u"
}