"unus et viginti" meaning in Latin

{
  "etymology_templates": [
    {
      "args": {
        "1": "la",
        "2": "ūnus",
        "3": "",
        "4": "one"
      },
      "expansion": "ūnus (“one”)",
      "name": "m"
    },
    {
      "args": {
        "1": "la",
        "2": "et",
        "3": "",
        "4": "and"
      },
      "expansion": "et (“and”)",
      "name": "m"
    },
    {
      "args": {
        "1": "la",
        "2": "vīgintī",
        "3": "",
        "4": "twenty"
      },
      "expansion": "vīgintī (“twenty”)",
      "name": "m"
    }
  ],
  "etymology_text": "From ūnus (“one”) + et (“and”) + vīgintī (“twenty”).",
  "forms": [
    {
      "form": "ūnus et vīgintī",
      "tags": [
        "canonical"
      ]
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "num",
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "name": "Latin cardinal numbers",
          "parents": [
            "Cardinal numbers",
            "Numbers",
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Latin entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "twenty-one; 21"
      ],
      "id": "en-unus_et_viginti-la-num-ouSD70gQ",
      "links": [
        [
          "twenty-one",
          "twenty-one"
        ]
      ],
      "synonyms": [
        {
          "word": "vīgintī ūnus"
        },
        {
          "sense": "Symbol",
          "word": "XXI"
        }
      ],
      "tags": [
        "indeclinable"
      ],
      "wikipedia": [
        "la:unus et viginti"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈuː.nus et u̯iːˈɡin.tiː/",
      "tags": [
        "Classical"
      ]
    },
    {
      "ipa": "[ˈuːnʊs̠ ɛt̪ u̯iːˈɡɪn̪t̪iː]",
      "tags": [
        "Classical"
      ]
    },
    {
      "ipa": "/ˈu.nus et viˈd͡ʒin.ti/",
      "note": "modern Italianate Ecclesiastical"
    },
    {
      "ipa": "[ˈuːnus ɛt̪ viˈd͡ʒin̪t̪i]",
      "note": "modern Italianate Ecclesiastical"
    }
  ],
  "word": "unus et viginti"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "la",
        "2": "ūnus",
        "3": "",
        "4": "one"
      },
      "expansion": "ūnus (“one”)",
      "name": "m"
    },
    {
      "args": {
        "1": "la",
        "2": "et",
        "3": "",
        "4": "and"
      },
      "expansion": "et (“and”)",
      "name": "m"
    },
    {
      "args": {
        "1": "la",
        "2": "vīgintī",
        "3": "",
        "4": "twenty"
      },
      "expansion": "vīgintī (“twenty”)",
      "name": "m"
    }
  ],
  "etymology_text": "From ūnus (“one”) + et (“and”) + vīgintī (“twenty”).",
  "forms": [
    {
      "form": "ūnus et vīgintī",
      "tags": [
        "canonical"
      ]
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "num",
  "senses": [
    {
      "categories": [
        "Latin cardinal numbers",
        "Latin entries with incorrect language header",
        "Latin indeclinable numerals",
        "Latin lemmas",
        "Latin multiword terms",
        "Latin numerals",
        "Latin terms with IPA pronunciation"
      ],
      "glosses": [
        "twenty-one; 21"
      ],
      "links": [
        [
          "twenty-one",
          "twenty-one"
        ]
      ],
      "tags": [
        "indeclinable"
      ],
      "wikipedia": [
        "la:unus et viginti"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈuː.nus et u̯iːˈɡin.tiː/",
      "tags": [
        "Classical"
      ]
    },
    {
      "ipa": "[ˈuːnʊs̠ ɛt̪ u̯iːˈɡɪn̪t̪iː]",
      "tags": [
        "Classical"
      ]
    },
    {
      "ipa": "/ˈu.nus et viˈd͡ʒin.ti/",
      "note": "modern Italianate Ecclesiastical"
    },
    {
      "ipa": "[ˈuːnus ɛt̪ viˈd͡ʒin̪t̪i]",
      "note": "modern Italianate Ecclesiastical"
    }
  ],
  "synonyms": [
    {
      "word": "vīgintī ūnus"
    },
    {
      "sense": "Symbol",
      "word": "XXI"
    }
  ],
  "word": "unus et viginti"
}