"tantum" meaning in Latin

{
  "categories": [
    {
      "kind": "other",
      "name": "Adverbes en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Lemmes en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Latin",
      "orig": "latin",
      "parents": [],
      "source": "w"
    }
  ],
  "derived": [
    {
      "word": "plurale tantum"
    },
    {
      "word": "singulare tantum"
    }
  ],
  "etymology_texts": [
    "Accusatif singulier, pris comme adverbe, de tantus.",
    "Il s’oppose à quantum selon un schéma que l’on retrouve en latin entre :\n:: talis - qualis ;\n:: tantus - quantus ;\n:: is - quis ;\n:: tot - quot.\n:: totiens - quotiens.\n:: tam - quam.\n:: tum - cum.",
    "La même corrélation se retrouve dans toutes les langues de la famille indoeuropéenne."
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "adv",
  "pos_title": "Adverbe",
  "related": [
    {
      "word": "iste"
    },
    {
      "word": "talis"
    },
    {
      "word": "tum"
    },
    {
      "word": "tunc"
    }
  ],
  "senses": [
    {
      "glosses": [
        "Ne … que, seulement, tant."
      ],
      "id": "fr-tantum-la-adv-S5NGskzf"
    }
  ],
  "synonyms": [
    {
      "word": "modo"
    },
    {
      "word": "solum"
    }
  ],
  "word": "tantum"
}

{
  "categories": [
    "Adverbes en latin",
    "Lemmes en latin",
    "latin"
  ],
  "derived": [
    {
      "word": "plurale tantum"
    },
    {
      "word": "singulare tantum"
    }
  ],
  "etymology_texts": [
    "Accusatif singulier, pris comme adverbe, de tantus.",
    "Il s’oppose à quantum selon un schéma que l’on retrouve en latin entre :\n:: talis - qualis ;\n:: tantus - quantus ;\n:: is - quis ;\n:: tot - quot.\n:: totiens - quotiens.\n:: tam - quam.\n:: tum - cum.",
    "La même corrélation se retrouve dans toutes les langues de la famille indoeuropéenne."
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "adv",
  "pos_title": "Adverbe",
  "related": [
    {
      "word": "iste"
    },
    {
      "word": "talis"
    },
    {
      "word": "tum"
    },
    {
      "word": "tunc"
    }
  ],
  "senses": [
    {
      "glosses": [
        "Ne … que, seulement, tant."
      ]
    }
  ],
  "synonyms": [
    {
      "word": "modo"
    },
    {
      "word": "solum"
    }
  ],
  "word": "tantum"
}