"Regnum Unitum" meaning in Latin

{
  "categories": [
    {
      "kind": "other",
      "name": "Compositions en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms propres en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Pays en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Latin",
      "orig": "latin",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Motcomposé de regnum et de unitus."
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "name",
  "pos_title": "Nom propre",
  "senses": [
    {
      "glosses": [
        "Royaume-Uni."
      ],
      "id": "fr-Regnum_Unitum-la-name-E3ZPjMWX"
    }
  ],
  "tags": [
    "neuter"
  ],
  "word": "Regnum Unitum"
}

{
  "categories": [
    "Compositions en latin",
    "Noms propres en latin",
    "Pays en latin",
    "latin"
  ],
  "etymology_texts": [
    "Motcomposé de regnum et de unitus."
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "name",
  "pos_title": "Nom propre",
  "senses": [
    {
      "glosses": [
        "Royaume-Uni."
      ]
    }
  ],
  "tags": [
    "neuter"
  ],
  "word": "Regnum Unitum"
}