"pro rata" meaning in Latin

{
  "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"
    }
  ],
  "derived": [
    {
      "lang": "Français",
      "lang_code": "fr",
      "word": "prorata"
    }
  ],
  "etymology_texts": [
    "Composé de pro et de ratus."
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "adv",
  "pos_title": "Locution adverbiale",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en latin",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "En proportion."
      ],
      "id": "fr-pro_rata-la-adv-OX6nu9hj"
    }
  ],
  "word": "pro rata"
}

{
  "categories": [
    "Compositions en latin",
    "Locutions adverbiales en latin",
    "Wiktionnaire:Sections de type avec locution forcée",
    "latin"
  ],
  "derived": [
    {
      "lang": "Français",
      "lang_code": "fr",
      "word": "prorata"
    }
  ],
  "etymology_texts": [
    "Composé de pro et de ratus."
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "adv",
  "pos_title": "Locution adverbiale",
  "senses": [
    {
      "categories": [
        "Wiktionnaire:Exemples manquants en latin"
      ],
      "glosses": [
        "En proportion."
      ]
    }
  ],
  "word": "pro rata"
}