"quartus" meaning in Latin

{
  "categories": [
    {
      "kind": "other",
      "name": "Adjectifs numéraux en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Dates manquantes en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Lemmes en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Ordinaux en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Latin",
      "orig": "latin",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "(Siècle à préciser) Voyez quattuor."
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "adj",
  "pos_title": "Adjectif numéral",
  "raw_tags": [
    "ordinal"
  ],
  "senses": [
    {
      "glosses": [
        "Quatrième."
      ],
      "id": "fr-quartus-la-adj-C5Su4YG~"
    }
  ],
  "sounds": [
    {
      "ipa": "\\kwartus\\"
    }
  ],
  "tags": [
    "numeral"
  ],
  "word": "quartus"
}

{
  "categories": [
    "Adjectifs numéraux en latin",
    "Dates manquantes en latin",
    "Lemmes en latin",
    "Ordinaux en latin",
    "latin"
  ],
  "etymology_texts": [
    "(Siècle à préciser) Voyez quattuor."
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "adj",
  "pos_title": "Adjectif numéral",
  "raw_tags": [
    "ordinal"
  ],
  "senses": [
    {
      "glosses": [
        "Quatrième."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\kwartus\\"
    }
  ],
  "tags": [
    "numeral"
  ],
  "word": "quartus"
}