"singulare tantum" meaning in Catalan

{
  "categories": [
    {
      "kind": "other",
      "name": "Locutions latines en catalan",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Locutions nominales en catalan",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Mots en catalan issus d’un mot en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Catalan",
      "orig": "catalan",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Du latin singulare et tantum."
  ],
  "lang": "Catalan",
  "lang_code": "ca",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en catalan de la grammaire",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Singulare tantum."
      ],
      "id": "fr-singulare_tantum-ca-noun-xlP0m2eK",
      "topics": [
        "grammar"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\siŋ.ɡuˈɫa.ɾe ˈtan.tum\\"
    }
  ],
  "word": "singulare tantum"
}

{
  "categories": [
    "Locutions latines en catalan",
    "Locutions nominales en catalan",
    "Mots en catalan issus d’un mot en latin",
    "catalan"
  ],
  "etymology_texts": [
    "Du latin singulare et tantum."
  ],
  "lang": "Catalan",
  "lang_code": "ca",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
      "categories": [
        "Lexique en catalan de la grammaire"
      ],
      "glosses": [
        "Singulare tantum."
      ],
      "topics": [
        "grammar"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\siŋ.ɡuˈɫa.ɾe ˈtan.tum\\"
    }
  ],
  "word": "singulare tantum"
}