"semel pro semper" meaning in All languages combined

{
  "categories": [
    {
      "kind": "other",
      "name": "Compositions en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Locutions adverbiales en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Wiktionnaire:Sections de type avec locution forcée",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Latin",
      "orig": "latin",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Composé de semel, pro et semper."
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "adv",
  "pos_title": "Locution adverbiale",
  "senses": [
    {
      "glosses": [
        "Une fois pour toutes."
      ],
      "id": "fr-semel_pro_semper-la-adv-6WOwev~Z",
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "word": "semel pro semper"
}

{
  "categories": [
    "Compositions en latin",
    "Locutions adverbiales en latin",
    "Wiktionnaire:Sections de type avec locution forcée",
    "latin"
  ],
  "etymology_texts": [
    "Composé de semel, pro et semper."
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "adv",
  "pos_title": "Locution adverbiale",
  "senses": [
    {
      "glosses": [
        "Une fois pour toutes."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "word": "semel pro semper"
}